8X42mm Natureview Birding Series roof prism

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This 8x Bushnell roof prism binocular sets a new standard for image quality at this sensibly-low price point. Images are more than acceptably bright and sharp. Chromatic aberration is comfortably under control. There are modest amounts of field curvature, barrel distortion, and astigmatism present if you look for them – but are all at low levels and are generally unobtrusive during use. While falling a trifle short of the optical performance of premium binoculars four and five times its very modest price, the Natureview Birding Series provides an image that was simply unobtainable at anything close to this price point only a few short years ago. You simply get more optical performance out of it than you might reasonably expect for so little money. In a word, this Bushnell is a great value. Ooops, that’s two words . . . but you probably get the idea.

Features of this binocular . . .

  • H-body roof prism with internal center focus.
  • Rugged die-cast body with black rubber armoring to protect the binocular from accidental bumps. The armor has ribbed gripping surfaces to provide a secure and comfortable grip in all temperatures and climates.
  • Fully multicoated optics for high light transmission.
  • Costly BaK-4 roof prisms precision-polished for high contrast as well as high light transmission.
  • O-ring sealed to be waterproof and fogproof in all weather extremes.
  • The Natureview Birding Series has 13mm of eye relief, so there will be some image vignetting for those who must wear eyeglasses when observing.
  • The rubber-rimmed eyecups twist up and down for quick changes between eyeglass wearer and non-eyeglass wearer use.
  • Only one and one-fourth turn of the comfortably-large ribbed focus knob moves from a good 10’ near focus to infinity.
  • A tripod adapter socket is built into the center hinge to allow the binocular to be mounted on a photo tripod for hands-free observing.
  • The Natureview Birding Series comes with an eyepiece rainguard, objective lens covers, a padded soft case with shoulder strap, and a binocular neck strap. The neck strap is on the narrow side. Despite the binocular’s light weight (only 23 ounces), a wider neck strap like the one recommended below would make a useful optional addition for extended carrying comfort.
  • Optical Type:
    The optical design of a binocular or spotting scope. A binocular can be either a porro prism (whose objective lenses are off-set and spaced further apart than the eyepieces) or a roof prism (whose objective lenses are in line with the eyepieces). A spotting scope can be either a porro prism or roof prism refractor or a catadioptric (a combination of lenses, mirrors, and prisms).
    Roof Prism
    Field of view:
    The field of view (FOV) is the amount of observable world one can see at any given moment.
    Field of view 1000 yards:
    Exit Pupil:
    The circular image or beam of light formed by the eyepiece of a telescope. To take full advantage of a scope's light-gathering capacity, the diameter of an eyepiece exit pupil should be no larger than the 7mm diameter of your eye's dark-adapted pupil, so that all of the light collected by the telescope enters your eye. (The eyepiece exit pupil diameter is found by dividing the eyepiece focal length by the telescope focal ratio.) Your eye's ability to dilate declines with increasing age (to a dark-adapted pupil of about 5mm by age 50 or so). For those in this age group, eyepieces with exit pupils larger than their eyes can dilate to simply waste their telescope's light-gathering capacity, as some of the scope's light will fall on their iris instead of entering their eye.
    Relative Brightness:
    A number used to compare the brightness of binoculars or spotting scopes of similar magnification. The relative brightness is determined by squaring the diameter of the exit pupil. The larger the relative brightness number, the brighter the image.
    Twilight Factor:
    A number used to compare the effectiveness of binoculars or spotting scopes used in low light. The twilight factor is found by multiplying the size of the objective lens (in mm) by the magnification and then finding the square root of that result. The larger the twilight factor, the more detail you can see in low light. A twilight factor of 17 or better if usually required for reasonable low light use.
    Eye Relief:
    Eye relief is the distance from the last surface of the eye lens of an eyepiece to the plane behind the eyepiece where all the light rays of the exit pupil come to a focus and the circular image is formed, sometimes called the “Ramsden Disk.” This is where your eye should be positioned to see the full field of view of the eyepiece. If you must wear glasses because of astigmatism, you’ll usually need at least 15mm of eye relief or longer if you want to see the full field of view with your glasses on.

    A note on our eye relief figures: Quite often, our eye relief figures will differ from those of the manufacturer. This is because we measure the “usable” eye relief, while the manufacturers specify their usually-longer (but technically correct) “designed” eye relief.

    The eye lens of the eyepiece is normally recessed below the rubber eyeguard or rubber rim of the eyepiece to keep the lens from being scratched during use. An eyepiece might have a “designed” eye relief of 15mm (and the eye relief will truly measure 15mm from the eye lens to where the image forms). However, if the eye lens is recessed 3mm below the eye guard, the Ramsden Disk forms only 12mm above the eyepiece body (the 15mm “designed” eye relief, less the 3mm of eye relief made unusable by having the eye lens recessed into the body of the eyepiece). This “usable” eye relief of 12mm (measured from the rolled-down eyeguard – the closest point you can get your eye to the eye lens – to where the image forms) is the eye relief figure we would measure and list in this website.

    Why is it important to list the “usable” eye relief? For those people who don’t wear eyeglasses while observing, a few mm difference between the eye relief they expect from the manufacturer’s literature and the shorter eye relief they actually get in real life doesn’t mean a lot. They can simply move a little closer to the eyepiece to see the full field, and never realize that the eye relief is a little shorter than they expected. However, some people must wear eyeglasses while observing, because of severe astigmatism. These observers can’t move closer to the eyepiece if the eye relief is shorter than expected because their glasses get in the way. For these people, the real life “usable” eye relief is more important than the technically correct but sometimes not fully usable “designed” eye relief. We measure and list the actual usable eye relief so that people in the real world can pick the eyepieces that will work best for them.

    Interpupillary Distance:
    Close Focus:
    How close you can get to an object and still see a sharp image of it in your binocular or spotting scope is called the “close” or “near” focus
    A binocular or spotting scope whose body is clad in rubber or polyurethane armor is said to be armored. Armor can be applied for looks, a better grip, noise-proofing, etc. An armored body does not guarantee that a binocular or spotting scope is waterproof, although most waterproof optics are armored.
    The weight of this product.
    23 oz.
    Limited Lifetime
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    General Accessories
    Binocular Accessories (1)
    Wide neoprene binocular neck strap, in black
    by Optech
    This product does not have supplied accessories... or supplied accessories have not been assigned.
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    Bushnell - 8X42mm Natureview Birding Series roof prism

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    Bushnell - 8X42mm Natureview Birding Series roof prism
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    Our Product #: BU842R
    Manufacturer Product #: 22-0842
    Price: $129.95
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    MSRP: $219.95

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    Clear skies,

    This Bushnell Birding Series general-purpose waterproof roof prism binocular simply gives you better medium power images than you have been accustomed to seeing in a binocular at its very reasonable price point . . .

    . . . our 35th year