Specifications for 10x21 RC I
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Model:  10x21 RC I 
Type: Roof-prism type binoculars
Magnification: 10×
Objective lens diameter: Ø 21 mm
Exit pupil diameter: Ø 2.1 mm
Actual field of view: 5.0°
Apparent field of view: 50.0°
Field of view at 1000 m: 87 m
Eye relief: 11 mm
Diopter adjustment range: Over ±2 m-1 
Eye interval adjustment range: 35–72 mm
Relative brightness: 4.4
Closest focal point: 2.5 m
Width (fully extended): 105.5 mm
Height: 92 mm
Depth (fully extended): 40 mm
Weight: Approx. 200 g
Optical coating: Multi-coating
Lens configuration: 6 elements in 4 groups
Other: Adjustable eyepieces (twist up/down).
High-index BaK4 prisms.
UV protection.

Specifications and design are subject to change without notice.
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