40/60/75X high power wide angle eyepiece for 50/60/78/82mm Nikon Fieldscopes

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This is a high power wide field eyepiece for long distance observing under bright lighting conditions with current Nikon 50mm, 60mm, and 82mm Fieldscopes (as well as older 78mm Fieldscopes). The field is over 50% wider than the Nikon zooms at the same magnifications, making this an excellent eyepiece for close-in observing or for scanning large flocks of birds. The optics are fully multicoated, using Nikon’s proprietary antireflection coatings, for high light transmission and contrast.

The eyepiece threads into place. To prevent accidental loss in the field, a rubber O-ring at the base of the eyepiece threads compresses as the eyepiece is screwed into the scope body. This locks the eyepiece in place to keep it from vibrating loose during transport and use. The O-ring also seals the scope against the entrance of dust and moisture. A roll-down rubber eyecup is standard. Rolling it up shields the eye from extraneous light for higher contrast non-eyeglass use. Rolling it down lets you get closer to the eyepiece for less-vignetted eyeglass use. Slip-on plastic dust covers are provided for both ends of the eyepiece.

With a 50mm Fieldscope the eyepiece provides 40x magnification, with a 1.25mm exit pupil, and a good field of view of 94’ at 1000 yards.

With a 60mm Fieldscope the eyepiece provides 60x magnification, with a 1mm exit pupil, and a good field of view for the magnification of 63’ at 1000 yards.

With an 82mm Fieldscope the magnification increases to 75x and the exit pupil to 1.09mm, while the field of view decreases to a still generous 52’ at 1000 yards. The performance is the same with older 78mm Fieldscopes as it is with the newer 82mm versions, except that the exit pupil is a somewhat smaller 1.04mm.

The eye relief is specified at 17mm with all scopes, for virtually unvignetted eyeglass views. While this is technically correct, the actual usable eye relief will typically measure somewhat less due to the recessing of the eyepiece lens to protect it from being scratched accidentally when the eyecup is in the down position for eyeglass use. A somewhat shorter eye relief than specified is typical of all spotting scope eyepieces.

Power:
Depends on scope
Field of view 1000 yards:
Depends on scope
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.

17mm
Weight:
The weight of this product.
6 oz.
Warranty:
1 year
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Nikon - 40/60/75X high power wide angle eyepiece for 50/60/78/82mm Nikon Fieldscopes

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Nikon - 40/60/75X high power wide angle eyepiece for 50/60/78/82mm Nikon Fieldscopes
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Our Product #: N60WN
Manufacturer Product #: 7465
Price: $245.00  FREE ground shipping - Click for more info
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New closeout, nearly $50 below dealer cost! This is a high power wide field eyepiece for long distance observing under bright lighting conditions with Nikon 50mm, 60mm, 78mm, and 82mm Fieldscopes . . .





. . . our 34th year