Roof Prism Binoculars

More Information  · Supplied Accessories  · Recommended Accessories  · Images of Some Features Price $339.00 $379.95 SAVE: $40.95 (10%) List Price $599.95 Optical Type Roof Prism Field of view 6.5° Field of view 1000 yards 341' Exit Pupil 4.2mm Relative Brightness 17.64 Twilight Factor 20.49 Eye Relief 17mm Interpupillary Distance 62-74mm Close Focus 10' Weight 28 oz. Height 5.4" Armored Yes Waterproof Yes Warranty Limited Lifetime

The Discoverer has a quite flat field, with little astigmatism and distortion, and good color correction. The high resolution and brightness of its 42mm objective lenses are superb for examining at high power the details and colors of distant birds in open field, lake, and shore-side birding. A good 10’ close focus makes it more than acceptable for occasional close-in birding, as well. The Discoverer is a surprising performer across a wide range of observing conditions, near and far, in bright sunlight and dim twilight alike. This is an optically and mechanically excellent high power binocular at a price only a fraction of similar-quality European optics. The Discoverer is a hard binocular to beat in its price range – or any price range.

Features of this binocular . . .

• Roof prism optics. H-body roof prism design with internal center focus. BaK-4 prisms for high light transmission. Its 5.4" length is easy to handle, and its 28 ounce weight won’t weigh you down during all-day birding.
• Large aperture fully multicoated optics. Large 42mm objective lenses gather substantial amounts of light for bright high power images in twilight or overcast conditions. The twilight factor is 20.49, well above the 17 recommended as a minimum for a low light binocular. The optics are fully multicoated on all air-to-glass surfaces with high transmission antireflection materials for bright, high contrast, natural color images.
• XTR prism coatings. Its high-transmission BaK-4 roof prisms use premium 60-layer XTR dielectric reflective coatings, the same as in the top-of-the-line $1000 Elite binoculars, for exceptionally high reflectivity and optimum color fidelity across the entire visible spectrum.
• Phase-coated prisms. The state-of-the-art PC3 phase coatings on the BaK-4 roof prisms eliminate the natural phase shift inherent in the light path of all roof prism binoculars that normally muddies small details. These coatings give you visibly sharper images and a more accurate color rendition. This is especially noticeable when viewing fine detail or when looking into the rising or setting sun at a silhouetted or backlit bird, where more color and detail is clearly visible in the shadowed areas of the bird.
• Waterproof and fogproof. O-ring sealed and nitrogen-purged to be totally waterproof, fogproof, and dustproof in all climate extremes. It will give you peak performance no matter where you are birding – a high humidity/high temperature Costa Rican rain forest, a cold salt spray-soaked New England shoreline, a high alpine meadow in Colorado, or your own back yard.
• Rainguard coatings. All external optical surfaces (objective lenses and eyepieces) are treated with permanent “Rainguard" coatings. These special hydrophobic (water-repelling) coatings cause the condensation from rain, fog, snow, or your own breath to form in much smaller droplets than on standard optical coatings. Smaller droplets scatter less light, resulting in higher light transmission and a clearer image, even in a driving rain.
• Armor. Clad in black armor to take every kind of rough treatment in stride. The armor also insulates the binocular to keep it comfortable to the touch in all temperatures, and is lightly textured to provide a sure grip in wet weather. Molded-in thumb grooves under the barrels keep the hands positioned for proper balance.
• Twist-up eyecups. A quick quarter-turn counter clockwise twist extends the eyecups for non-eyeglass use. A clockwise twist on the rubber-rimmed eyecups retracts them into the binocular body for eyeglass or sunglass use.
• Long eye relief. Eye relief is specified at 17mm. While this is technically correct, the actual usable eye relief will typically measure somewhat less due to the recessing of the eyepieces when the eyecups are in the down position for eyeglass use. A shorter eye relief than specified is typical of all binoculars, although this Bushnell is much closer to being accurate in its specification than most manufacturers. Some vignetting of the image will be visible for most eyeglass wearers.
• Close focusing. Focusing is reasonably fast at one and a quarter turns from the 10’ close focus out to the horizon.
• Rotary diopter correction. A small 23 click-stop diopter adjustment lever is located at the front of the large ribbed focusing knob to allow you to match the binocular optics very precisely to your individual eyesight for the sharpest images.
• Supplied accessories. The binocular comes with a wide cloth-wrapped neoprene neck strap that makes the lightweight binocular easy to carry during all-day birding sessions. An eyepiece rainguard, objective lens covers, and soft vinyl case complete the supplied accessories.