8X40mm Natureview Birder porro prism

by Bushnell Print

What would you like to print?
(Reviews and Documents/Videos will not be printed)

Basic Product Information
Full Description
Tech Details
Supplied Accessories
Recommended Accessories

More product information
This 8-power Bushnell Natureview Birder is the most economical full-sized binocular we carry. Despite its low price, it is optically good enough to keep a beginning birder happy for years. The Natureview Birder is a super gift to start a new birder on a lifelong hobby.

The 14' close focus of this Bushnell Birding Series binocular is reasonably good for such a modestly priced binocular. Combine that with the bright images of its 40mm objectives, and the Natureview Birder is very useful for close-in woodland birding as well as more long distance observing across open fields.

The Bushnell Birder also makes a great second binocular for friends or family members to use when they come visiting, as well as a very affordable second binocular to toss in the car for traveling or vacations. It’s an excellent value when cost is important, as its quality is quite surprisingly good when you consider its very modest price.

Features of this binocular . . .

  • Classic Z-body BK7 porro prism design.
  • A large ribbed center focus wheel lets you focus both eyepieces of the binocular simultaneously.
  • Black rubber armor protects the Birder from accidental bumps and provides a secure and comfortable grip in all temperatures and climates.
  • Fully magnesium fluoride anti-reflection coated on all air-to-glass optical surfaces for high light transmission, with strategically-applied multicoatings on some surfaces.
  • The Natureview Birder has 14mm of eye relief, so there will be very little image vignetting for those who must wear eyeglasses when observing.
  • Rubber eyecups roll up and down for quick changes between eyeglass wearer and non-eyeglass wearer use.
  • A diopter adjustment on the right eyepiece lets you individually match the binocular eyepieces precisely to your eyesight for the best views.
  • A tripod adapter socket in the center hinge allows you to mount the Bushnell Birder on a photo tripod for hands-free observing by using an optional tripod adapter.
  • The Bushnell Natureview Birder comes with snap-in eyepiece and objective lens covers, a padded soft case with shoulder strap, and a binocular neck strap. The neck strap is a little on the narrow side, so despite the binocular’s light weight (only 24.8 ounces), a wide padded neck strap like one of those recommended below might make a useful optional addition for more comfortable all-day carrying.
  • 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).
    Porro 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.
    24.8 oz
    Limited Lifetime
    There are currently no Cloudy Nights reviews associated with this product

    User Ratings/Reviews from our Customers (www.astronomics.com)
    Overall Product Rating: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics(0.00)   # of Ratings: 0   (Only registered customers can rate)

    General Accessories
    Binocular Accessories (5)
    Wide neoprene binocular neck strap, in blue
    by Optech
    Wide neoprene binocular neck strap, in green
    by Optech
    Wide neoprene binocular neck strap, in black
    by Optech
    Wide neoprene binocular neck strap, in red
    by Optech
    Tripod adapter for both roof and porro prism binoculars
    by Celestron
    This product does not have supplied accessories... or supplied accessories have not been assigned.
    No documents have been associated with this product.
    No videos have been associated with this product.
    There are currently no formulas associated with this product
    Bushnell - 8X40mm Natureview Birder porro prism

    Click icon(s) below & hover image above for zoom

    Bushnell - 8X40mm Natureview Birder porro prism
       · No ratings/reviews   Only registered users can submit ratings - Register Here
    Our Product #: BU840
    Manufacturer Product #: 118401
    Price: $57.95  Ground shipping for this item is $8.95 - Click for more info
    By adding 1 of these items to your cart your order total will be less than $100, and will ship within the 48 contiguous United States for $8.95. Add $42.05 to your order, however, and you qualify for free ground shipping (heavy items with fixed shipping, such as counterweights, excluded).
    MSRP: $79.95

     E-mail this product to a friend E-mail this product to a friend

    Your Email:  
    Your Friend's Email:  
    Confirm Friend's Email:  

      200 characters or less

    An email containing a link to this product has been sent to the email address you provided.

    Clear Skies!

     Have a question? Do you have a question about this product?
     Found a better price? Found a lower price? Click to let us know... or call 800-422-7876 before you buy.

    If you’ve found a lower delivered price on this product, let us know about it below. We’ll do our best to meet or beat that price and will get back to you within one business day with our best offer. Thanks for giving us the opportunity to give you a better deal.

    Your Name:  
    From Who:  
    Context:  Magazine AdOnline
    Website Address:  
    Cut and paste the web address into the box above
    Your Email:  
    Confirm Email:  

    We’ll do our best to meet or beat that price and will get back to you within one business day with our best offer. Thanks for giving us the opportunity to give you a better deal.

    Clear skies,

    This Bushnell Natureview Birder is the most economical full-sized 8x binocular we carry. Despite its low price, it is optically good enough to keep a beginning birder happy for years . . .

    . . . our 38th year