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Technical data

BF 8x42

BF 10x42

Magnification

8 x

10 x

Front lens diameter

1.65 inch / 42.0 mm 

1,65 inch / 42.0 mm 

Exit pupil

0.21 inch / 5.25 mm 

0.17 inch / 4.2 mm

Field of view

389 ft at 1,000 yds 7.4°

342 ft at 1,000 yds 6.5°

129 m at 1,000 m 7.4°

114 m at 1,000 m 6.5°

Eye relief

0.71 inch / 18.0 mm

0.60 inch / 15.0 mm

Close distance

3.94 ft / 1.2 m

3.94 ft / 1.2 m

Over run (

)

4 dpt 

4 dpt

Diopter adjustment

±4 dpt 

± 4 dpt

Twilight factor

18.3

20.5

Geom. Twilight no.

27.6

17.6

Operating temperature

14° up to 122° F

14° up to 122° F

-10° up to +50° C

-10° up to +50° C

Waterproof

yes,  down  to  9.84 ft / 3.0 m

yes,  down  to  9.84 ft / 3.0 m

Height x Width x Depth

5.5 x 5.0 x 2.0  inch

5.5 x 5.0 x 2.0  inch

140 x 127 x 51  mm

140 x 127 x 51  mm

Weight approx.

27.5 oz / 780 g

27.5 oz / 780 g

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