Spotting Scopes

Archive for the ‘Barska Spotting Scopes’ Category

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The Barska Benchmark 25-125×88 Waterproof Straight Spotting Scope is the ultimate scope for impressive results, even under difficult conditions. The large 88mm objective lens provides 25 to 125x power magnification and is filled with nitrogen to guard against fogging and moisture damage. O-ring seals around the edge give complete waterproof protection while the fully-coated lenses prevent scuffs and scratches. Made using a compact, aluminum-cased design, you can take (more…)

20-60×60 WP Spotting Scope

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Big meets massive! With crystal clear clarity and extreme ruggedness, nothing rivals the vigor of Gladiator’s unparalleled performance. Gladiator superior optics reveals every detail in optimum contrast, high brilliance color and sharp resolution. Tough in harsh weather conditions, these scopes are ideal for long-range big game stalking. Spotting will never be the same with Gladiator scopes. Spot the magnificence. Backed by Limited Lifetime Warranty.

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A spotting scope is a portable telescope, optimized for the observation of terrestrial objects. The magnification of a spotting scope is typically on the order of 20X to 60X.
The light gathering power of a spotting scope is determined by the width of the objective lens, typically between 55 and 80 mm. All else being equal, the larger the objective, the more heavy and expensive the spotting scope.

There are three types of scope “straight-through” (the eyepiece is on the same axis as the body of the scope), “angled” (the eyepiece is at an angle of about 45 degrees to the body of the scope), and, rarely, a more complex, shoulder-mounted design. Straight-through scopes are easier to use from inside a vehicle while angled scopes are more comfortable for tall people and more easily shared by people of different heights.

The choice of the eyepiece lens determines the overall magnification. The best magnification is decided by a number of factors.

Magnifications of less than 20X are unusual, as (much cheaper and lighter) binoculars or monoculars can provide this. Magnifications of more than 60X lead to poorer brightness and, even on a tripod, shake can be a problem. The field of view is also limited

A zoom lens is a mechanical assembly of lens elements with the ability to vary its focal length (and thus angle of view), as opposed to a fixed focal length (FFL) lens (see prime lens). They are commonly used with still, video, motion picture cameras, projectors, some binoculars, microscopes, telescopes, telescopic sights, and other optical instruments.
A true zoom lens, also called a parfocal lens, is one that maintains focus when its focal length changes. A lens that loses focus during zooming is more properly called a varifocal lens.

Zoom lenses are often described by the ratio of their longest to shortest focal lengths. For example, a zoom lens with focal lengths ranging from 100 mm to 400 mm may be described as a 41 or “4×” zoom. The term superzoom or hyperzoom is used to describe photographic zoom lenses with very large focal length factors, typically more than 4× and ranging up to 15× in SLR camera lenses and 26× in amateur digital cameras. This ratio can be as high as 100× in professional television cameras.[1] As of 2009, there are no photographic zoom lenses beyond about 3× with imaging quality on par with prime lenses, and constant fast aperture zooms (usually f/2.8 or f/2.0) are typically restricted to this zoom range. Quality degradation is less perceptible when recording moving images at low resolution, which is why professional video and TV lenses are able to feature high zoom ratios. Digital photography can also accommodate algorithms that compensate for optical flaws, both within in-camera processors and post-production software.

Photographic zoom lenses should not be confused with telephoto lenses, those with a narrow angle of view. Some zoom lenses are telephoto, some are wide-angle, and others cover a range from wide-angle to telephoto. Lenses in the latter group of zoom lenses, sometimes referred to as “normal” zooms, have displaced the fixed focal length lens as the popular one-lens selection on many contemporary cameras.

Below is an example of the different zoom arranges available

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