Pentax 8x21 UCF-R Mini Binoculars

Press to open modal with high resolution version of current image


Show Description

This compact porro-prism unit offers nice optics for a nice price. A good choice for those who prioritize weight, size, and affordability.

  • Front and back surfaces of eyepiece and objective are multi-coated. The rest of the lenses have basic anti-reflective coating.
  • 8x magnification.
  • Close focus is 2.8m.
  • Optics use quality BaK4 prisms.
  • Small 21mm objective lenses are compact, but the reduced size and weight allows only modest brightness and performance at dawn or dusk.
  • 13mm eye relief may not be comfortable when used with eyeglasses.
  • With UCF designs, only the eyepieces move to adjust eye-to-eye width. This offers better long-term alignment than equivalent-sized, centre-hinge styles.

Tech specs

Show Tech specs

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

Objective lens

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

Lens coating

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.

Field of view

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

Minimum focus

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

Relative brightness

A measure of image brightness. The greater the realtive brightness number the better the binoculars will perform in dim light.

Exit pupil

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.

Eye relief

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

Dimensions 8.3 x 4.8cm
Dust proof No
Fogproof No

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.

Diopter adjustment

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

Includes case Yes
Made in China