Category Archives for Monoculars

zhumell 10-25×42 waterproof zoom monocular

Zhumell 10-25×42 waterproof zoom monocular is stated to be the preferred choice for sports, adventure, wildlife, and entertainment loving enthusiasts.

The exterior body is protected with a rubber armor to make it waterproof and resistant to the elements. The design patterns of the ridges, housing, eyepiece and the focusing lever are meant to give you flexibility in focusing and magnification.

The monocular could work with the equal efficiency of resolution and clarity for long distance and short distance watching. The monocular has a rating of 4.3 out of 5 stars.

zhumell 10-25×42
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​Pros

  • Field of view width is stated to be appreciably high
  • Convincing hand grip with the exterior rubber armor
  • Tripod adaptability
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    Magnification range from 10X to 25X
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    The nearest focus is indicated to be 6.5 feet
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    42mm curved objective lens for maximum light absorption
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    Easy to zoom dials
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    Comfortable eye relief
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    Anti-glare construction

​Cons

  • The neck strap could cause discomfort while using the monocular over an extended period

Key Features

Objective Lens

The objective lens of the Zhumell measures 42mm. It is supposed to be designed for maximum light absorption from the surroundings. The multiple coatings on the lens could help in covering the target entirely by reducing the glaring effects and enhancing the image clarity.

Eye Relief

The Zhumell monocular is stated to have an eye relief of 14-9.5mm. This feature is supposed to enhance the fullness of the viewing angle considerably. You may get better coverage of stationary and moving objects with considerable clarity.

This feature could be particularly beneficial if you happen to wear eyeglasses. The design of eye relief is stated to be in synchronization with the magnification factor of the objective lens to enable full-size target object viewing.

Close Focus

The closest focus of the Zhumell monocular is stated to be 6.5feet. This feature is supposed to enhance the spotting scope for large and small sized objects that are located closer. It is supposed to show you the detailed features of the target object without distortion and a high level of clarity.

​Magnification

Magnification range of the monocular is from 10X to the maximum of 25X. It is supposed to be flexible for manual adjustments. It could show you the intricate details of a small object regardless of the distance and its movement.

You may zoom-in or zoom-out with a right field of view without compromising on precision and clarity.

The 42mm object lens diameter with good light absorption ratio and variable magnification could make the Zhumell monocular ideal for sports and wildlife watching.

Exit Pupil

​The exit pupil of the Zhumell monocular has a dimension of 2.8-14mm. It is stated to deliver the maximum volume of light from the object lens into your eyes. It is also supposed to enhance the magnification, clarity, and brightness of the image.

It is stated to work even in low light conditions (sunset, dense forest, early morning time just before sunrise, etc.) to give you the optimum visibility. You may increase or decrease the magnification of the object lens without affecting the quality of the exit pupil functionality.

Monocular Length

The length of Zhumell monocular is stated to be 6.2". The design of the barrel, bridge, and the eyepiece are declared to be in synchronization with the length for producing high-quality images.

Zhumell Monocular Review

Purpose: The Zhumell monocular is stated to be designed for sports and wildlife watching. The flexible nature of zooming and magnification could enhance the short and long distance watching experience. You could mount it on a tripod to enable extended viewing with 180-degrees to 360-degrees coverage.

Zoom: The Zhumell monocular is supposed to provide even image brightness regardless of the zooming range. It could mean you may watch a frog at a distance of 300 feet with the same clarity as you see a deer at a distance of 6.5 feet.

FOV: The Zhumell monocular is stated to give you a higher field of view over a distance of 300+feet and also at a distance of 65 feet. This feature could make it easy to spot and view continually moving objects at variable speeds. You may experience the benefits of this feature while viewing baseball and soccer games from a distance. Ball spotting and following it through its motion could become comfortable with the help of the Zhumell monocular.

Similarly, this feature could be helpful while you are engaged in bird watching. You could focus on them while they are resting and moving unpredictably on tall trees.

How does it Compare  

The other products which could come close to the features of the Zhumell monocular are the Orion monocular. Both the monocular devices seem to have nearly the same design specifications regarding object lens, length, exit pupil, and eye relief. 

Where Orion Scores

orion 10-25x42 waterproof monocular
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  • Close Focus: The close focus length of Orin is stated to be 2feet, while the Zhumell monocular has a narrow focus of 6.5 feet.  However, the practical application need of a monocular could start after a distance of 5 to 6 feet.
  • Wrist Strap: The Orion monocular is stated to have a firmly attaching wrist strap for excellent grip. The inbuilt feature of the Zhumell monocular may not include the feature, but it is reported to have rubber armor with comfortable housing for excellent grip.

Where Zhumell Scores

zhumell 10-25×42
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  • Focus Style: The focus style of Zhumell monocular is stated to be versatile while that of Orion is stated to be centered. That means the linear and angular field of view could be higher for Zhumell compared to the Orion. 303feet of Zhumell compared to 126feet of Orion if you wish to go by numeric values.
  • Image Clarity: According to the user reviews, the magnification, brightness, and image clarity of the Zhumell monocular are stated to be better than those of the Orion when it comes to viewing during the early morning and late evening hours.
  • Eye-Relief: Zhumell monocular could score over in eye relief due to its variable value between 14-9.5mm, while it is stated to be fixed at 14.5mm for Orion.

Vortex Monocular Reviews 2018

Monocular is a single lens supported optical device meant for the purpose of long range viewing of objects, with inbuilt precision tools for image magnification, range coverage, multiple spotting scope, resolution of image colors and custom views.

Vortex is said to be well known brand of monocular with many models and versions supporting applications like wildlife watching, travel and leisure.

Some of the most commonly recommended models of Vortex are listed below:

Vortex Optics Recce
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Technical Features of Vortex Monocular

The design and functionality of the device are to be covered in the technical features of the device. The design part is supposed to be meant for the hardware components, while the functionality could cover the efficiency of the components and their coordination with each other to produce high definition images when the device is in action.

Monocular

Design Features

Some of the common components of a typical vortex monocular are said to be the objective lens, protective arm, rubber armor, clip, image focus tool, eyepiece lens, and eyecup, reticle, external casing and the other internal moveable and non moveable parts to support the device.

The design of the Vortex objective lens is said to be optimal, as the manufacturers claim it reduces the optical aberrations to by considerable level. The standard Vortex model (applicable to all models as the generic feature) with single objective lens is said to have a curved focal surface. This lens could absorb variable wavelengths of light from the target object and brings them to a point of single focus. The aperture and focal length of the Vortex monocular lens are said to be adjustable to produce real time images of target objects, in the possible ranges within the scope of the given Vortex model.

Objective Lens –Technical Review

Most models of Vortex lenses are fully coated for single as well as multiple layers of the lens. Standard Vortex monocular lenses are said to be coated mostly within the wavelengths of the light falling in the yellow and green region part of the light’s wavelength. Manufacturers state that this is the region in which the device is capable of rendering effective color capturing functionality. The typical Vortex monocular objective lens is made of several layers to form HD glass. When the coating is done in the multiple layers, it is supposed to increase the light absorption feature of the lens and increase the target object’s visibility range and image quality along with original color display with near zero scattering.

The aperture of the lens directly depends on its diameter value. You could optimally control the contrast and brightness of the resulting image by regulating the knobs provided in the device. This is said to be common for all types of Vortex monocular model lenses. The process of manufacturing and finishing of the lens could be varied to produce objective lenses of variable aperture quality with the same dimensional values.

Objective Lens –User Perspective

As a user you might have observed good quality images being relayed by the lens under varying external conditions where the temperature and humidity keep changing. You could keep it going by simple maintenance procedure to keep the objective lens in stable working condition.

  • Cleaning the external surface of the lens with the manufacturer recommended tools and liquids could keep it free from scratches caused by dirt and other pollutants.
  • Covering the lens with standard cap when not in use keeps it safe from damages and direct exposure to UV. Following the instructions in the user manual while cleaning the lens could prolong the expected lifespan and stated quality features.

Monocular Prism – Technical review

Some of the vortex models of monocular devices are said to be fitted with roof prism while the others are said to work without them. The choice of using the prism seems to be dependent on the required output image format and quality.

  • The roof type prism is said to be good for varying the contrast and brightness of the incoming light from the lens to customized levels. Besides, this type of prism is suppose to have multi coated layers of walls for reducing the volume of scattering and wayward reflections, brining the entire beam of light waves into a single point of focus. This is supposed to increase the image clarity under variable contrast and brightness values. The light beam entering from the objective lens is said to go through a straight path due to inversion and reversion processes.
  • The aperture of the prism is supposed to have an optimum value for due to the compact physical structure. However the brightness variance values are said to be relatively higher, probably due to the stated tolerance limit of the roof part of the prism. Since this type of prism is also said to be used in astronomical observations, this feature could also be helpful in viewing the long range target objects on earth!

Monocular Eyepiece – Technical Review

The characteristics of the eyepiece are said to be based on the objective lens and the prism. According to monocular manufacturers this is said to be due to the error correction factors of the prism and lens. Some of them related quality, contrast and brightness are said to be correctible only to certain maximum extent in the two, leaving part of the corrections to be made by the design positioning of the eyepiece lens.

  • The monocular eyepiece lens can be in angular or straight position. This is to enable the proper focusing on the images formed by the light rays emerging from the prism/objective lens (in case of monocular without prism). The angle of variation in the standard Vortex monocular devices is said to vary between 45 degrees and 90 degrees.
  • The distance between the eyepiece lens and the eyecup is also said to be variable in some models of the Vortex monocular devices, varying the final image’s brightness and sharpness according to the need.

Monocular Eyepiece – User Perspective

  • Cleaning the external surface of the eyepiece lens with the manufacturer recommended tools and liquids could keep it free from scratches caused by dirt and other pollutants.
  • Covering the lens with standard cap when not in use keeps it safe from damages and direct exposure to UV. Following the instructions in the user manual while cleaning the lens could prolong the expected lifespan and stated quality features.
Vortex Recce Pro HD

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Key Features

  • This device is said to have an optimum combination of objective lens and eyepiece lens diameters for effecting good magnification. The close range focus of the lens is said to be relatively down to the single digit value in feet while the maximum length could exceed the 3 digit value in yards.
  • The lens of this device is said to have an angular field of view for capturing images of objects in the inclined and declined positions with respect to the observer.
  • ​This device is said to be equipped with an HD grade glass and argon filled internal barrels for enhancing the clarity of images without possible aberrations like distortions, internal reflections, scattering, color variation etc.
  • This device is said to have a strong external casing for water and fog proof characteristics.

Pros

  • This device is said to have a wide range of view which extends to cover the width and length in an optimized ratio for producing clear images. The angular rotation of the eyepiece lens is supposed to cover objects in the horizontal plane as well as inclined planes.

Cons

  • This device is said to have no inbuilt prism and night vision utilities.
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Vortex Tactical Monocular

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Key Features

  • This device is said to have lenses made from low dispersion glass to give relatively bright and clear images. The process of manufacturing and finishing is said to result in multiple focal length options which are said to be helpful for wildlife watching, bird watching and viewing aquatic birds and species.
  • This device is said to have high definition lens with multiple layers of fully coated glass. This is said to enhance the light absorption feature of the lens from various angles. The feature is said to be especially helpful in trapping the light from the peripheries of the lens. This is supposed to increase the target object’s visibility range and image quality. Optimum level of color distortion and scattering is supposed to result in near to display of the target object’s original color to the nearest value.
  • This device is said to have a good casing for water proofing and fog proofing characteristics.

Pros

  • This device is said to be compatible for viewing with or without eyeglasses, giving maximum possible value of eye relief and exit pupil within the scope of parameters on which these two values are said to be dependent.

Cons

  • This device is said to have no support of prism and nigh vision options.
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Vortex 8x25 Solo Waterproof

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Key Features

  • This device is said to have an objective lens with high resolution. The multiple layers of fully coated glass is said to increase the light absorbing characteristics. The feature is said to be especially helpful in trapping the light from the peripheries of the lens.
  • Variable focal length is said to be enabled due to the optimum alignment and distancing between the objective lens and the eyepiece lens. Light rays entering from multiple angles into the objective lens are said to be streamed into a single line, making the resulting image relatively sharper and brighter.
  • Aperture values of the lens are said to be custom made and adjustable for varying the contrast and brightness.

Pros

  • This device is said to be protected by an O-ring which prevents moisture, fog. Heat and mist from entering the optical barrels of the device. This is also supposed to protect the device from extreme weather conditions.

Cons

  • This device is said to have no options for prism and night vision features.
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Vortex Solo 10x36 mm Monocular

Vortex 10x36 Solo

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Key Features

  • This device is said to be a roof prism which is supposed to ensure optimum quality of image display due to the said inversion and reversion of the light rays as they pass through the walls of the transparent walls and get reflected on the coated layers. Since aluminum or silver is said to be used for coating the reflecting walls of prism, this is said to result in clear images.
  • Roof prism is said to be highly compact in nature when compared to the other models, making the device light in weight.
  • ​This device is said to have an angular field of view for capturing images of objects in the inclined and declined positions with respect to the observer.
  • Contrasting feature seems to be slightly more compared to the brightness features of the device. However the controlling options in the knob could restore balance to certain extent.

Pros

  • This device is said to be supported by a roof prism.

Cons

  • This device is said to have no night vision compatible components.
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Vortex 10x25 Solo Waterproof

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Key Features

  • This device is said to be equipped with a roof prism which is supposed to enhance the characteristics of the incoming light from the objective lens. As the light rays go through various transparent walls and gets reflected from the multiple angled walls (coated with silver or aluminum), they get streamlined into one beam. This is said to be made of the constituent colors of the light as reflected from the target object. The filtering of non relevant colors at this layer is supposed to give the original color display of the target object without distortion.
  • This device is said to be equipped with an adjustable type of eyecup which is said to move up and down in vertical direction. Combined with the angular movement of the eyepiece lens, this is supposed to give linear and inclined views of objects which are in plains, uphill and downhill.
  • Contrasting and brightness features of the device is said to be relatively on equal proportions due to the optimum objective lens diameter.

Pros

  • This device is said to be supported by a roof prism.

Cons

  • This device is said to have no night vision compatible components.
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Conclusion

After reading through the different monocular devices from Vortex, the choice had to be between Vortex Optics Solo 10x25 Waterproof Monocular and the Vortex Solo 10x36 mm Monocular since both are said to be supported by a roof prism of same model.

However, the Vortex Optics Solo 10x25 Waterproof Monocular seemed to score better supposedly due to its lens diameter and magnification ratio. This is supposed to balance the contrast and brightness feature which is said to be essential for a good monocular.

If you want to see how these models compare to a list of best rated monoculars on the market today, then click the link.

Best Monocular with rangefinder 2018

Best Monocular with rangefinder 2017

Monocular with rangefinder feature and night vision options is considered to be highly effective for multipurpose applications like golfing, wildlife watching, hunting and a variety of activities related to long rage viewing and distance measurements. Some of the most commonly recommended products which could be useful for your selection are in the list.

LaserWorks Multifunction Laser
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Technical and Functional Features of the Monocular Rangefinder

Design Parameters

· The principal parts of the device are said to be the object lens, receiving lens, LASER emitter, eyepiece and the protective body along with the battery and sockets. The effective ways in which they can be designed determine the efficiency of the rangefinder. For the most optimum design the three lenses are to be placed along the single line of assembly. This could be horizontal or vertical. The LASER emitting lens is preferably placed at the center so as to enable the reflected waves to be captured equally by the other two lenses.

· A goof monocular rangefinder has three distinct features related to optics, range finding and measuring and speed detection. The third feature is said to be responsible for the accurate detection and viewing of moving objects.

· The volume of light reflected by the target object determines its clarity of image in the eyepiece of the device. A good rangefinder is supposed to be capable of emitting LASER with a concentration level which covers all possible dimensional objects at short and long ranges.

· Normally the dark objects at long range distances are tough to be detected and viewed by the human eyes. The resolution of the rangefinder can help in overcoming this limitation. A good rangefinder is said to be capable of capturing the images of all such objects through effective mode selection. Ready to measure, continuous scan and data recall are some of the standard modes supported in general by many rangefinders of professional grade.

· Amplification of the optic system within the object lens and the receiving is said to be responsible for the targeting and viewing functions. This feature could be capable of enhancing the scanning of objects during low light time. This is also said to be responsible for the object magnification to the most optimum levels.

· Target Reflection capturing is an essential feature of the monocular rangefinder. Standard quality devices are said to be capable of capturing the least possible reflections under fading lights also. This feature is said to be enhanced by the combination of the lenses and the prism used in the rangefinder. When the light from the target object enters the receiver lens, it gets enhanced in strength depending on the quality of the device.

· Reduced light reflection is a feature which enables the device in absorbing the maximum possible light from the target objects. This could be enabled by painting the lens with a coat of non reflective material which is also highly transparent in nature. This helps in avoiding blurring of images and enhances their clarity for rangefinder and viewer parts of the device. You need to make sure that the light contrasting features of the device are kept at the lowest possible values in order to keep the light reflections near to zero levels.

· Object lens assembly design needs to be compatible for low dispersion and colour correction. This is an essential feature since the aperture size of the lens cannot be varying on either side far away from inter-papillary distance of the viewer (you). Moreover the aberration and other probable distortion factors also need to be reduced to the minimum possible levels.

· Reduction of errors in field curvature, coma, chromatic and spherical aberration are said to be enabled in a good monocular rangefinder by the alignment of lens with the prism and eyepiece. According to optics experts these features can be reduced from the system but not eliminated. Hence you need to select a monocular rangefinder device which has minimum possible error values.

Functional Features of Monocular Rangefinder

Bearded tattooed man holding beer bottle.

Many users often complain that their device seems to be “not so perfect” in spite of spending time and money to search and buy what they think is the best. This could be due to the practical reasons that reduction of errors in the optical devices like the monocular rangefinder, it is possible to enhance the good qualities.

· Chromatic aberration is reduced by the selection of achromatic type of lens. This is said to be capable of bringing two or more colors from the incoming light into a single point of focus. Semi apochromatic types of lens which can also reduce the value of chromatic error to great extent.

· By reducing the coma error (poor quality), the quality of the rangefinder device can be automatically improved. This is said to be made possible by the combination of two opposite comas within the same lens with embedding. Keeping the field angle and the aperture of the lens at optimum levels is another way in which it is possible to increase the quality of the rangefinder device lens.

· The refracting surfaces within the lens and the prism can have their impact on the intensity of light passing through them. As the angle of refraction increases it is possible to increase the intensity of incoming light by the convergence of multiple focal planes into a single point. This is one way in which the quality of image for monocular as well as rangefinder functionalities of the device can be improved.

· Air transparency is a factor which can affect the image quality to a critical extent. Natural elements like fog, smoke, rain and other factors can reduce the transparency of air. This can be compensated by enhancing the strength of LASER emitting lens and absorption power of the receiving lens. Optic experts recommend the usage of DAK4 or Dk7 types of prism along with multiple coated lenses in order to increase the power of receiving lens and object lens.

· Software Installation in the device is one more way in which the reflected waves from the target object can be strengthened. This feature is said to be helpful in reducing the effect of natural elements like fog, smoke, rain and other factors. This is also said to be capable of solving the problems associated with focusing on large size objects in the shorter range and smaller size objects in the longer range.

Recommended Product Reviews

LaserWorks LRNV009 Day and Night Multifunction Laser Ranging Night Vision Monocular

LaserWorks Multifunction Laser

Our Rating:

Key Features

· The device is said to have inbuilt features for increasing the quality of vision during day and night with the digital night vision feature. The added feature like digital compass is said to increase the intensity of incoming light and directional features.

· The device is said to be capable of measuring the pitch angle with reference to the roof of the lens. This feature is supposed to be helpful in detecting the angle of slope towards inclination as well as declination. According to manufacturers it is possible to vary this angle with the help of hardware adjustments in the wheel and software adjustments.

· Pressure and temperature measurement features of the device are said to be for controlling the all weather working conditions. The specifications given by the manufacturers state that by sensing the variation in these two factors, it might be possible for the auto control mechanism to calibrate the LASER beaming lens and receptor lenses for optimum image capturing and display.

· The stated optical amplification of the system by the manufacturers is said to be capable of enhancing the image clarity, regardless of the range of focus and size of the object.

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Pros

  • The unique features of this device are said to be the ranging scope and the speed scope along with the night vision. This might make it possible for the device usage to capture moving objects during night and day without any hassles. This is perhaps one of the reasons for which the device is recommended for hunters and golfers.

Cons

  • The device has a metal body which could make its weight relatively more.
Seesii Eyoyo Rangefinder

Our Rating:

Key Features

· The device is said to have pin seeker technology built into it. This is supposed to increase the probability of flag point detection in the golfing sport.

· The pitching speed measuring tool of the device is said to be capable of capturing fast moving objects. This feature is said to be useful for wildlife watching as well.

· The multilayer coating in the object and receiving lens is supposed to give the capacity of absorbing maximum volume of reflected light from the target object. The contouring angles in the lens and the prisms are supposed to be responsible for maximum focus of reflected light at one focal point in the center of the receptors, increasing the clarity of vision.

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Pros

  • The accuracy of distance measurement and speed measurement with high value magnification are said to give the golf range finder the capability for wildlife watching also during daytime.

Cons

  • The device may not be supported by the Night vision capacity since there is no explicit mention in the specification sheets.
Target Handheld Monocular

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Key Features

· This device is said to be recommended for long range distance measurement and object finding purposes, which supposedly makes this device good for hunting and golfing.

· The inbuilt tools are said to be capable of switching the mode of the device between rangefinder and the normal ranger.

· The layout of lens and prism within the device is said to be efficiently designed to capture maximum incoming light with near zero back reflections from the lens areas.

· The device is said to be capable of measuring the angle heights accurately for both inclinations and declinations. This feature is supposed to make possible the detection of the ball and the pins due to its pin sensing ability, along with flag points.

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Pros

  • Measurements of accurate angle in the short and long ranges along with height is said to make the device recommended for golfing. Pin sensing is said to make the device suitable for trainee golfers.

Cons

  • The device is said to have no options for night vision.
ROXANT Grip Scope

Our Rating:

Key Features

· This device is said to be designed with complete glass based optical tools for supporting the lenses (LASER, object and receptor) and the prism. The BAK4 green prism is said to split the incoming light into its basic ingredients, making the image true colour in nature.

· The alignment of lenses, prism and the eyepiece is said to be designed for elimination of chromatic ad spherical aberrations. This is said to be made possible by the integration of linear and lateral incoming light into single point of focus.

· The eye cup of the device is said to be highly retractable in nature, making it suitable for viewing with or without eyeglasses.

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Pros

  • Wide View scoping and spotting is said to be one of the main features of the device making its scope recommended for multipurpose applications. Power scope of the device is said to be optimal for light transmission and high definition image display.

Cons

  • The device is said to have no night vision features.
Vortex Tactical Monocular

Our Rating:

Key Features

· This device is said to be inbuilt with roof prism and highly optimized magnification features. According to the manufacturers, this combination might help in the elimination of errors in resolution quality, positioning, distortion and other types of optical aberrations.

· Reticle range of the device is said to be normalized for producing long and short range focusing with equal accuracy.

· Multi coating on the receptor and object lenses are said to make the lenses absorb maximum percentage of reflected light from the target objects without reverse reflections. This is said to be a feature which gives bright and compact images without blurring in fog, smoke and rain.

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Pros

  • Water and rainproof design with reticle range are the features, which are supposed to make the device recommended for golfing and wildlife viewing applications.

Cons

  • The device is said to have no night vision

Conclusion

The LaserWorks LRNV009 Day and Night Multifunction Laser Ranging Night Vision Monocular is said to be the pick of the recommended devices. This could be due to the functionality of the system which is compatible with the other systems. In addition the device is said to have night vision support.

· In addition the device is said to have measurement tools for gauging temperature and pressure, which is said to be recommended for usage in all types of weather conditions.

· The device is said to be capable of being calibrated with software which supposedly gives extra customization options.

​This page https://opticinfozone.com/optics/monocular/ has been created to review monoculars in general, so if you have not found what you were looking, please check it out.


Best Monocular for Bird Watching 2018

Best Monocular for Bird Watching 2017

Bird watching as a hobby and profession could be made highly successful when you use the right sort of monocular built with the latest design and operational technologies.

You could get accurate views, wide range of coverage, enhanced field of view; bright display and near zero errors. Some of the recommended products which might be useful to you in taking a decision to choose from could be from the list.

Polaris Optics Explorer
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Technical Features of Bird Watching Monocular

The technical features of the bird watching monocular could be categorized into sections related to the design, functionality, safety and ease of use. All of them get connected to produce the most optimum features you might need.

bird watching

Design Features

· The monocular design depends on the construction of the lens and the assembly of the prism. The accuracy of vision is ensured by the integration between objective lens, the prim assembly and eyepiece.

· Configuration of objective lens is said to be optimal when it can reduce the optical aberrations to near zero level. The typical monocular device will have a single lens with curved focal surface. Multiple wavelengths of light from the target object are brought into single focus. In this aspect the relation between aperture and focal length of the monocular is said to be important for clear vision.

· Coating on the lens can be in single or multiple layers. This is used for reducing the reflections from the surface of the lens. A coated lens can avoid reflections to the extent of 9.8%. Most of the standard monocular lenses are coated in the green and yellow part of the light’s wavelength.

According to optical experts this is the region where the human eye is most sensitive. Multilayered coating is said to be more effective as it absorbs all the reflections and gives better quality image to the monocular prism and the eyepiece.

· The proper design of the lens also helps in reducing the errors of various types when you go for bird watching. Common ones among them are distortion, aberration, coma and the field curvature.

· The quality of lens aperture can effectively reduce the volume of light loss around the target bird’s peripheral region. This is said to be quite common for all types of monocular lenses. This is done when the finishing of the lens is done during the manufacturing process.

· The isosceles prism is mounted at the center between lens and the eyepiece. The hypotenuse of the prism is exactly at right angle with the axis, making the image go through multiple reflections before being displayed in the eyepiece.

A good monocular is said to have inbuilt contrast adjusting features to make the clear image. The ability of the monocular to absorb maximum light from the surrounding of the target object and producing a clear image under varying environmental conditions is said to be the most recommended feature for bird watching.

· The standard monocular prism is of two basic two types namely the BAK4 and the BK7. BAK4 has relatively higher refractive index. This is said to result in a lesser critical angle.

This is designed to reduce the internal reflection losses to near zero. On the other hand BK7 type of prism is said to be preferable for night vision monocular when the light from the external sources is very dim.

· The monocular body of the standard devices is designed by keeping the position of the lens, prism and the eyepiece in view. The position of the eyepiece could be either to the side of the lens and prism assembly or on top. In some of the monocular types the eyepiece can also be mounted in line with the lens.

Make sure that “eye cup” covering the eyepiece makes your viewing comfortable. Lightweight body of the monocular is one factor which can ensure portability and flexibility of usage. Standard monocular devices are made from reinforced lightweight polymers that can provide high level of tensile strength and heat resisting capacity.

You need to pay special attention to these two factors while selecting the monocular.

Recommended Product Reviews

Polaris Optics Explorer High Powered 12X50 Monocular

Polaris Optics Explorer

Our Rating:

Key Features

· The device is said to be equipped with a standard replaceable 50-mm lens is said to provide magnification factors which are recommended for hobby and professional bird watchers.

· The device is said to be supported by a multipurpose tripod whose legs. According to the manufacturers this sort of design could be useful for all types of planar and rugged surfaces.

· The device is said to have a water and rainproof external shield. Manufacturers state that the internal architecture is designed for eliminating the probability of fogging also.

· The adjustable rim on the outer surface of the eye piece is said to be useful for varying the angle of viewing and the distance between the prism and the prism eyepiece. This is said to be useful for increasing the clarity of the bird images, depending the distance between your standing position and the bird location.

· Focus wheels of the device are said to be variable in angle and focal length. By adjusting these values, you are said to be capable of rotating the angle of view from 0 degrees to 90 degree. With this sort of viewing you might be able to watch birds on horizontal and vertical planes of the tree, including reverse hanging birds like the bats.

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Pros

  • High resolution magnification is said to be one of the key features of this monocular for bird watching. Reflection absorption is said to give you closer views of birds over water bodies like lakes and rivers.

Cons

  • Using focus wheels could be confusing in the initial stages for the beginners due to its reported sensitivity.
Polaris Optics EagleEye

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Key Features

· The device is said to have a single hand focus wheel that might make it easy to change the length and angle while viewing the birds.

· The eye cups are said to be adjustable in nature which might make it comfortable for watching with the eyeglasses.

· The manufacturers state that the optical structure of the lens and the prism is designed to absorb the reflections and fine tune the image into the eyepiece. This is said to be one of the features which reportedly enhances the image clarity. When the birds are on water bodies like lakes and rivers, the volume of light reflected from water could cause blurring of the bird’s image. This oddness is said to be eliminated to the maximum extent by the design of the lens and prism.

· The device is said to be Water and fog proof which is supposed to work in all types of weather conditions. According to the manufacturers you could use this device during winter and rainy seasons also without any major deviation in the quality of images.

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Pros

  • The device is said to be slip proof and drop proof which might make it good for all terrain use.
  • The device is said to be capable of being supported by a tripod which reportedly gives you hands free experience of bird watching in tough terrains.

Cons

  • Adjusting the focus manually to overcome reflections from water to watch aquatic birds could be tough for beginners.
Polaris Optics Outdoorsman

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Key Features

· The device is said to be supported by an optimized reticle which is supposed to be good for measurement of angular focus. According to manufacturers this feature might support distance measurement of the target object from your current location. According to optical technologists this is recommended when the target size is relatively smaller and the focus range is long.

· The device is said to have a good field of view which could be optimized for long and short distances. The coverage are of the object is also said to be variable. According to manufacturers this helps in focusing on larger objects that are in the closer range and smaller objects which in the longer range.

· The relative motion of the object lens is said to be with the optical prism. When you in change the focal length to cover small size objects, the passing of light from the lens through the prism is said to be optimally controlled for reducing the reflections of light coming from the exteriors of the object body. This is supposed to give sharper images.

· The relation between fast focusing and close focusing is said to be relatively accurate with this device. The manufacturers state that this is made possible by the spotting scopes compatibility between angular and linear focus.

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Pros

  • The optical structure of the device is said to be its main feature which is supposed to be a combination fast focus, accurate scan and enhanced field of view.

Cons

  • Focal length adjustment through wheels is said to be very sensitive, making it tough for starters.
Aurosports Waterproof Monocular

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Key Features

· The device is said to have good optical resolution features which are compatible for long distance bird watching. The manufacturers state that the focal length of the object lens can be varied dynamically in order to switch between long and short distance views.

· The device said to be good for moving and flying birds also. According to the manufacturers this feature is enabled by the continuous image capturing speed of the lens. The transmission of image through the prism into the eyepiece is said to happen in real time with reported near zero delay. You might be able to get a clearer glimpse of the flying bird.

· The angle of refraction in the installed prism is said to be variable in nature. The manufacturers state that with this feature it is possible to get a clear image of the birds when they are behind obstacles like leaves.

· The lens of the device is said to be coated to reduce the volume of reflections considerably. Moreover the manufacturers state that you might be able to differentiate between the color of the bids and their background settings like green leaves, branch colors and other objects. This might enable you to analyze the birds’ features by talking a relatively enhanced closer look at them.

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Pros

  • According to the manufacturers the wide range of angular and linear focal points are said to be the main features of the device.

Cons

  • The focal length adjustment is said to be difficult when the target objects are behind obstacles like tree branches.
Authentic ROXANT Grip Scope

Our Rating:

Key Features

· The device is said to be made with high end precision optic lens supported by the BAK4 type of green prism. According to manufacturers, this combination is supposed to give a higher value of refractive index with sharp focus capability. The glass used in the prism is said to be highly accurate in dispersing the light into its constituent basic colours, giving you the original colour display of the target object without any distortion.

· The coating on the lens is supposed to eliminate the light reflections to a considerable extent. According to the manufacturers this is in conformation to the standards which govern the quality of optical devices used for bird watching.

· The varying focal length of the lens is said to be streamlined with the focal surface and the plane. This could alter the horizontal distances between the center of focus and the point where the light falls on the lens. The angle of curvature of the lens is said to be designed in line with the prism in such a manner that all the light could get focused onto a single point. This is stated to be a plus point which might eliminate the error in quality of the image.

· The multicoated lens is said to be efficient in removing the anomaly of reflective surfaces, making it absorb maximum light from the target object.

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Pros

  • BAK4 type of prism is said to be the most important component of the device which might make the device useful for accurate long and short distance bird viewing.

Cons

  • BAK4 glass might not be able to redirect the light entering it from vertical points effectively, though such probabilities are said to be very rare.

Conclusion

Having seen the basic and advanced features of the products, the recommended one seems to be the Authentic-ROXANT-Grip-Scope-Retractable Monocular.

· Chromatic aberration is said to be very low. This is relevant to horizontal and lateral aberrations. According to optics experts this feature could be helpful in getting high resolution images in all possible weather conditions and terrains.

· The device is said to have maximum number of glass made components built into it. This feature is said to be good for optic sensitive tasks like bird viewing. This is because of the distance of focus, image clarity, anti reflection, anti aberration and optimization of angular views are said to be synchronized by the device.

If you want to learn more about monoculars, then read our comprehensive guide on monoculars. Otherwise we would recommend you look at our Home Page for the best Optics on the planet.