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Compact, Go-Anywhere Design

Coupling a compact, palm-sized body with 21mm objective lenses, the UCF R 8×21 provides outstanding optical performance and go-anywhere portability for a wide variety of applications, from outdoor nature observation to indoor theatrical viewing.

Bright, Clear Image Field

Combining multi-coated optical elements with high-refraction BaK4 glass prisms, the UCF R 8×21 assures high light transmission and reflection for a bright, clear image field. It also incorporates aspherical optical elements to deliver a clear, well-defined image with minimal distortion, even at the edges.

Dependable Rubber Housing

The UCF R 8×21 is encased in a durable rubber housing to ensure a firm, comfortable hold and excellent shock-resistant performance.

Innovative Dual-Axis Eye-Distance Adjustment System

The PENTAX-original dual-axis eye-distance adjustment system makes it quick and effortless to adjust the distance between two eyepieces, even when you share the binoculars with someone else.

Models8 x 21 UCF R
TypePorro prism, center focusing (Linked-dual-axis)
Lens construction(Objective lens)2 elements in 1 group
(Eyepiece lens)3 elements in 2 groups
Objective lens Diameter21mm
Real field of view6.2°
Apparent field of view50°
Field of view at 1000m108m
Field of view at 1000 yard324ft
Exit pupil2.6mm
Eye Relief13mm
Relative Brightness6.7
Diopter adjustment range±4m-1
Eye Width adjustment range58 – 72mm
2.3 – 2.8 inches
Focusing rangeApproximately 2.8m to infinity
Approximately 9.2ft to infinity
Eyepiece ringSlide type
Body colorBlack
Height & Width83 x 110mm
3.2 x 4.3 inches
1.9 inches
7.4 oz.
AccessoriesEyepiece lens cap, Case, Strap

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