Nikon 8291 16-48x65mm EDG Angled Body Fieldscope with Eyepiece review

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Nikon is proud presenting EDG, a fieldscope for those whose adventurous spirit and dedication to success demandsperformance above all else. The most dynamic and advanced fieldscope in the company’s history, EDG (pronounced “edge” was engineered using Nikon’s latest innovative technology, but refined by nearly a century of glass-making heritage. The same incredible, high-resolution performance from the EDG Fieldscope has been provided inside the remarkable EDG Fieldscope line. Some with the features inside the new EDG Fieldscope line include the same exclusive ED glass lenses and dielectric high reflective multilayer prism coatings as his or her Fieldscope counterparts, delivering extraordinarily high contrast images in a very sleek Fieldscope body.

The EDG Fieldscope line’s proven Nikon ED (Extra-low Dispersion) glass means sharp, clean edge-to-edge clarity and resolution while the fully multicoated lenses guarantee premium brightness.

Larger, 85mm and 65mm lenses allow for the wider field of view—and both models come complete having an EDG zoom eyepiece, and therefore are compatible with a new group of interchangeable EDG fixed power eyepieces for custom viewing. The EDG Fieldscope line is available in a angled or straight body to accommodate any expedition.

“By incorporating many of Nikon’s new technologies the new EDG line of Fieldscopes gives hunters the absolute most suitable choice for long range viewing,” said Jon LaCorte Senior Product Marketing Manager. “Combine among these Fieldscopes with an EDG Fieldscope and you're ready for almost any hunt on any continent.”

The new king of full-sized Nikon Fieldscopes, the pro-level EDG 85mm provides the ultimate in optical performance thanks to Nikon’s exclusive optical design with ED lenses. A rugged waterproof, fogproof new body design allows users to consider this new Fieldscope around the most demanding hunts within the world.

Supreme ruggedness plus a substantial objective lens result in the 65mm EDG Fieldscope an ideal choice when counting every ounce in a pack, but still have to see every detail around the hunt which has been planned for years. The new EDG won’t disappoint, delivering extraordinarily bright, high-resolution views and truly remarkable low-light performance. All waterproof and fogproof in the stylish, lightweight new body design.

Nikon EDG Key Highlights

Pushing the Limits of Optical Perfection The EDG Fieldscope harnesses the optical superiority of Nikon’s legendary and dear ED (Extra-low Dispersion) glass to push the limits of optical perfection. Coveted by the world’s greatest photographers is Nikon’s legendary Nikkor lenses, this exclusive glass was developed to eliminate chromatic aberration occurring when light rays of varying wavelengths pass through optical glass. Nikon EDG Fieldscopes offer the identical results to the world’s most serious optics users--high contrast, high resolution images which can be razor sharp and clear of flare. Enhanced



Enhanced Resolution with Phase-Correction Coated Roof Prisms. Nikon’s EDG optical system incorporates phase-correction coated roof prisms to boost resolution, too as dielectric coated sub-prisms to optimize light transmission. Interacting with fully multicoated lenses and ED glass, the high-grade prisms deliver extremely bright, clear, vivid images over the periphery of the viewing field.
A Rugged, Durable Fieldscope The Nikon EDG Fieldscope was made having a rugged waterproof, fogproof body design which allows users to look at this new Fieldscope around the most demanding hunts within the world
Nikon EDG Additional Highlights

Long Eye Relief Eyepieces In all models the Nikon EDG features long eye relief for optimum view with or without eyewear.

Fixed Power Eyepieces The EDG Fieldscopes are compatible having a new group of interchangeable EDG fixed power eyepieces for custom viewing.

Warranty Information
Nikon is dedicated to quality, performance and total customer satisfaction. In case your Nikon Fieldscope, Spotting Scope or Fieldscope requires service or repair not covered by our 25 Year Limited Warranty, Nikon will repair or change it out (even it was your fault) for $10, plus return shipping and handling.

Excludes – StabilEyes, Laser Rangefinders and Spotting Scope/Fieldscope eyepieces.

FAQ’s

Real field of view

Real field of view could be the angle in the visible field, seen without moving the Fieldscopes, measured in the central point from the objective lens. The larger the worthiness is, the wider the viewfield available. For example, Fieldscopes with a wider field of view are advantageous for locating fast-moving wild birds from the viewfield. This applies to find small nebulas or even a cluster of stars in astronomical observations.
Apparent field of view

Apparent field of view is the angle in the magnified field once you examine Fieldscopes.
The larger the apparent field of view is, the wider the joy of view you is able to see even at high magnifications.

With the traditional method used previously, the apparent field of view was calculated by multiplying the true field of view through the Fieldscope magnification. (With this formula, apparent field of view wider than 65˚ is named wide field of view.)
Relative brightness

Relative brightness value is obtained by squaring the diameter from the exit pupil. The greater the relative brightness is, the brighter the look will be. With 8x42 Fieldscopes, the brightness is (42÷8)2= 28.1. This means that if the magnification will be the same, the bigger the effective diameter from the objective lens, the brighter the style will be.

Do Fieldscopes while using same exit pupil offer the identical brightness?

No. Brightness can vary even if the exit pupil is the same. This is for the reason that amount of sunshine reaching the viewer's eyes varies according for the quantity of lens elements superiority lens/prism coatings. Superior optical design and quality coating greatly contribute on the brightness of Fieldscopes. Brightness values specified by product brochures, etc. are theoretical ones calculated within the design process. Please note these factors when comparing actual brightness values.

Prism Coatings

Multilayer coating can also be put on prisms to raise transmittance. A roof prism system has one surface that does not feature total internal reflection, so vapor deposition with metals, etc. have to be used to boost the reflectivity with this surface. Also, phase-correction coating on roof surface ensures high-contrast images.

* Fieldscopes' brightness and contrast are suffering from not only prism coatings, but in addition the number of objective lens and eyepiece lens, and kinds of coatings.

Metal-vaporized, high-reflectivity prism coating

Using vacuum-vaporization technology, metallic material for example aluminum or silver is applied towards the reverse side of an prism surface that just isn't totally reflective. This raises the reflectivity from the prism mirror surface.

Dielectric high-reflective multilayer prism coating

This coating features reflectance that exceeds 99%. By utilizing light interference, this coating assures high reflectivity through the full visible range, and ensures high color reproducibility.
Reflectance characteristics of prism coatings on mirror surface

The horizontal axis indicates the wavelength of light. The vertical axis indicates the reflectance of light. Binoculars' brightness is determined not only from the reflective mirror, but also through the total optical system like the variety of lenses and excellence of coatings.
Phase-correction coating

A roof (Dach) surface can cause phase shift of light that affects image resolution. This phenomenon is caused by phase differences arising from total light reflection over a roof (Dach) surface and yes it can happen with even a perfectly processed prism. Phase-correction coating is used towards the surface to lower lack of resolution, ensuring high-contrast images.
Chromatic Aberration
• Photos are simulated viewfinder images. This is caused by the difference in light wavelength. The focus or magnification of your lens varies according for the wavelength of each form of incident light. Therefore, if you have a peek at an image through a lens with chromatic aberration, color fringing may occur. Because just one lens cannot compensate for chromatic aberration, two lenses of different optical characteristics are combined to improve this aberration. Nikon's original ED (Extra-low-Dispersion) glass lenses effectively compensate for color fringing.
ED glass and secondary spectrum
Visible light is composed of lights of various wavelengths. Gathering up all of those lights to your point is perfect for objective lenses.
With a single lens, because light is bent inside in an identical way as which has a prism, the focal lengths of lights with assorted wavelengths vary. As a result, don't assume all light rays reach the identical point, which causes chromatic aberration.
An achromatic lens made out of conventional glass materials can match focal lengths of two different wavelengths. For red and blue colors, for example, that have both ends in the wavelengths of visible light, chromatic aberration could be reduced to your certain extent by conforming their focal lengths. However, with additional detailed examination, because light with other wavelengths including green has different focal lengths, residual chromatic aberration results. This residual chromatic aberration is called secondary spectrum.
Combinations of conventional glasses cannot solve this secondary spectrum problem, but particular optical materials which have a very unique characteristic of dispersion are needed.
ED (Extra-low Dispersion) glass has this excellent characteristic then when combined with other glasses, minimizes the results from the secondary spectrum. Comparing to achromatic lenses, ED glass reduces chromatic aberration to some remarkable degree.

Twilight Factor

The factor which has the best impact on resolution or image detail, is gonna be dependent upon the amount of light available during the time of observation. During daylight hours, when your eye pupil size is planning to be just about 2 to 3mm, magnification will be the principal factor in image resolution. At night, while using eye pupil dilated to 6 to 8mm, aperture size will be the controlling factor. In twilight conditions both of those factors control resolution effectiveness along with the twilight factor could be the term that compares binocular performance under these conditions.

The twilight factor is calculated by utilizing the square root from the product in the magnification and the aperture. The higher the twilight factor, the better the resolution with the binocular when observing under dim light conditions. For example, a 10 X 40 (twilight factor 20) would effectively resolve better under these conditions than the usual 7 X 35 (twilight factor 15.4) even though the 10 X 40 features a smaller exit pupil. Remember, however, that this twilight factor does require into consideration the transmittance or quality of the optical system.

The incredible, high-resolution performance in the EDG binocular has become available inside a remarkable new EDG Fieldscope line. Some from the features inside the new EDG Fieldscope line include a similar exclusive ED glass lenses and dielectric high reflective multilayer prism coatings as his or her binocular counterparts, delivering extraordinarily high contrast images in the sleek Fieldscope body. The EDG Fieldscope line's proven Nikon ED (Extra-low Dispersion) glass means sharp, clean edge-to-edge clarity and resolution while the fully multicoated lenses guarantee premium brightness. Larger, 85mm and 65mm lenses allow for the wider field of view—and both models come complete with an EDG zoom eyepiece, and therefore are compatible with a new number of interchangeable EDG fixed power eyepieces for custom viewing. The EDG Fieldscope line can be acquired in a angled or straight body to suit any expedition. "By incorporating a lot of Nikon's new technologies the newest EDG distinctive line of Fieldscopes gives hunters the absolute best option for long range viewing," said Jon LaCorte Senior Product Marketing Manager. "Combine among these Fieldscopes by having an EDG binocular and you are ready for just about any hunt on any continent."



Legendary ED (Extra-low Dispersion) Glass Lenses. Deliver the superior sharpness and color correction for unmatched detail resolution
High Grade Optics and Multicoating Technology. Carefully cut and polished glass is coated in multiple layers of anti-reflective compounds for bright resolution brilliant color and uncompromised low-light performance
Eyepieces with Eye Box Technology. From zoom to wide angle, to long eye relief, there are seven different eyepieces to customize your viewing. EDG Fieldscopes are packaged with the zoom eyepiece.
Advanced Apochromat. Even, superior chromatic aberration compensation system
Waterproof/Fogproof. O-ring sealed and dry nitrogen filled to handle the toughest conditions (up to 10minutes submersed at 16.4 ft)