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<p>Zero in on an eagle's nest or the series of rapids you want to scope. These binoculars offer quality Pentax multicoated optics in a compact size.  The UP line are porro-prism binoculars with a dual-axis, single body housing with synchronized eyepiece adjustment. Aspherical lens elements give you edge-to-edge sharpness.</p><ul><li>Multicoated optics allow max light transmission with minimal internal glare and flare</li><li>Uni-body design has few moving parts and synchronizes the eyepiece movement</li><li>Aspherical lenses provide exceptional clarity from the centre to the edges of your field of view</li></ul>

Pentax UP 8x21 Binoculars

This tells you how many times an object is magnified when observed through the binoculars.

The diameter of the objective lens will impact how bright, sharp, and comfortable your view is. Generally, bigger is better.

Lens coatings reduce light loss and glare to increase contrast and diminish eyestrain. Coated: one layer on external surfaces only. Fully coated: every surface is coated. Multi-coated: multiple layers on some of the surfaces. Fully multi-coated: multiple layers on every optical surface.

The widest dimension of circular viewing area that you can see.

The nearest distance at which the binoculars will focus on an object.

The diameter of the objective (outside) lens divided by the binocular's magnification. It indicates the amount of light that reaches your eye (most noticeable in low light conditions). Higher numbers offer brighter images.

The distance between the eyepiece and your eye while still allowing entire field of view. Long eye relief is good for eyeglass wearers.

Waterproof binoculars are assembled with O-rings and are purged with nitrogen to avoid condensation. They are ideal for boating or use in rainy weather.

These binoculars can be adjusted for variances between right and left eye vision.

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Pentax UP 8x21 Binoculars

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