Fieldscope 50mm, straight viewing, 13-30x zoom

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The Nikon 50mm Fieldscope ED is a compact and lightweight straight-through viewing spotting scope that’s perfect for tucking in with your binoculars when you travel. But don’t let its diminutive size fool you. The Nikon Fieldscope 50mm packs all the image quality and features of its bigger brothers into an easily-transported body that weighs less than half that of typical-sized spotting scopes. The waterproof Nikon 50mm Fieldscope uses an ED (extra-low dispersion) glass element in its objective lens to provide extremely bright and razor-sharp images.

Whether you’re looking to extend your life list at remote birding hot spots, or just looking at the feeders and nests in your backyard, the Nikon Fieldscope 50mm gives you exceptional optical performance in a small and easily-handled package. The Nikon 50mm Fieldscope is not inexpensive, but with performance that rivals and often exceeds that of larger competitive scopes in the same price range, the Fieldscope is well worth its price if a light weight and compact size are important to your observing and travel needs.

Optical features of this scope . . .

  • ED glass: The extra-low dispersion ED glass element in the Nikon’s 50mm doublet objective lens combines high light transmission with very low chromatic aberration. This gives markedly reduced color fringing at the edges of the field when compared with conventional crown and flint glass optics, plus excellent color fidelity and saturation across the field.

  • Fully multicoated: The optics are fully multicoated with Nikon’s proprietary high transmission antireflection coatings for an excellent light transmission that complements the excellent color fidelity of the ED objective lens.

  • Zoom eyepiece: The standard equipment 13-30x multicoated zoom eyepiece has a rubber-rimmed eyecup that twists up, shielding the eye from ambient light for better contrast when observing with the unaided eye. The eyecup twists back down to provide greater eye relief for eyeglass use. The eye relief is 12.9mm at 13x. There will be some minor vignetting of the field for eyeglass wearers.

  • Other eyepieces available: A wide selection of optional eyepieces are available for the Fieldscope, in addition to the standard equipment 13-30x zoom. There’s a 13-40x zoom with a slightly longer 14.1mm eye relief. There is also a 27x (with short eye relief that is not suited to eyeglass use) and long eye relief 20x, 27x, and 40x fixed magnification models with eyeglass-friendly 17mm or better eye relief. There are also 16x, 27x, and 40x eyepieces designed for digiscoping.

  • Excellent close focusing: The scope focuses down to an exceptionally close 9.8’, making it unsurpassed for viewing backyard feeders, although the field is little more than 6” wide at this short a distance. Through the scope, looking at a bird at this distance at 13x would effectively be the same as looking with your unaided eye from only 9” away.
Mechanical features of this scope . . .
  • Fully waterproof: The Fieldscope’s die-cast body is compact, lightweight and durable (only 11” long and 19 ounces in weight, including eyepiece). It is O-ring sealed and dry nitrogen purged to be totally waterproof and fogproof in all weather and temperature conditions. This allows the scope to survive sudden showers as well as full monsoon conditions, and to resist internal fogging, no matter how cold the air temperature or how high the humidity.

  • Convenient focusing: The scope’s long focusing knob is grooved for a sure grip. It is located at the top center of the prism housing to allow precise focusing with either hand, even while wearing gloves or mittens.

  • Straight-through viewing: The Fieldscope’s straight-through design is generally better for quickly locating birds in the field than a 45° viewing angle model. With a straight-through scope, you can sight over the barrel to center in on the bird before trying a high power eyepiece view that often has a confusingly narrow field. It is difficult to sight over a 45° viewing barrel, as the prism housing and eyepiece can block the view. On the other hand, a 45° viewing angle is generally more comfortable than a straight-through scope for watching treetop activity or for extended observing from a blind or back porch. You won’t get a crick in your neck from crouching over to look through the scope as you often have to with a straight-through model on a too-short tripod. A 45° model is also more convenient for couples of varying heights who must share a single scope, as there’s little need to constantly raise and lower the tripod to a comfortable height for each observer. The Nikon #N50AWZ is a 45° viewing model, should that style be more convenient.

  • Photo tripod mounting: The 50mm Fieldscope mounts on any photo tripod having a standard 1/4”-20 thread mounting bolt.

  • Supplied accessories: Protective dust covers are provided for both the objective lens and the eyepiece.

  • 25-year warranty: In addition to the 25-year limited Nikon USA warranty, the 50mm Fieldscope is also covered by Nikon’s unique no-fault warranty. If anything happens to the Fieldscope that’s not covered by Nikon’s normal 25-year warranty, it costs you only $10 and return shipping and handling to get it fixed or replaced! Whether you drop the Fieldscope out of a canoe, drive off with it on the roof of your car, or loan it to a clumsy friend who uses it to drive tent pegs, there’s no need to worry. If you can send back the pieces, you’re covered by Nikon’s no-fault warranty.
Magnification:
Magnification is the ability of a telescope to make a small, distant object large enough to examine in detail. If you look at the Moon (250,000 miles away) with a 125 power (125x) telescope, it's essentially the same as looking at it with your bare eyes from 2000 miles away (250,000 ÷ 125 = 2000). The same telescope used terrestrially will make an object one mile away appear to be only 42 feet away (5280 feet ÷ 125 = 42).
The magnification of a telescope is determined by dividing the focal length of the telescope (usually in millimeters) by the focal length of the eyepiece used (again, usually in millimeters; but in all cases by the same unit of measurement used for the telescope focal length). For example, a 2000mm focal length telescope and a 10mm focal length eyepiece will give you a magnification of 200 power (2000 ÷ 10 = 200). The same 2000mm telescope with a 20mm eyepiece will give you 100x (2000 ÷ 20 = 100).
13-30x
Field of view 1000 yards:
157' @ 13x
Near Focus:
9.8'
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.

12.9mm @ 13x
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.
3.8mm @ 13x
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.
25.50 @ 13x
Aperture:
This is the diameter of the light-gathering main mirror or objective lens of a telescope. In general, the larger the aperture, the better the resolution and the fainter the objects you can see.
2"
Armored:
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.
No
Waterproof:
Yes
Weight:
The weight of this product.
19.6 oz.
Warranty:
"No-Fault" 25 Years Limited
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40/60/75X high power wide angle eyepiece for 50/60/78/82mm Nikon Fieldscopes
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Nikon - Fieldscope 50mm, straight viewing, 13-30x zoom

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Nikon - Fieldscope 50mm, straight viewing, 13-30x zoom
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Our Product #: N50SWZ
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The 50mm Nikon Fieldscope is a very high quality waterproof spotting scope with all of the features and image quality of Nikon's bigger Fieldscopes, just in a smalller body . . .





. . . our 34th year