Magnification 15x 18x
Obj. lens diameter 56mm
56mm
Exit pupil 3.7mm 3.1mm
FOV
4.5°
3.7°
Apparent FOV (FOV x Power)
67.5°
66.6°
Field of view (ft/1000 yds) 236
194
Brightness 13.9
9.6
Light transmission (%) 92.90% 92.90%
Twilight factor 29
31.7
Multi Position Eyecups Y/N Yes
Yes
Eye relief 17.8mm 18mm
Near focus 9.8ft 9.8ft
Eye width adjustment 56~75mm
56~75mm
Dimension WxHxD 6.1x8.2x2.5
6.1x8.2x2.6
Weight 45 oz 45 oz
Lens constr. obj. 3 groups 4 elements (ED)
3 groups 4 elements (ED)
Lens constr. ocular 4 groups 6 elements 4 groups 6 elements
Prisms type Abbe-Koenig
Abbe-Koenig
Prism reflective coating type N/A
N/A
ED glass Flourite
Flourite
Lens coating Scratch and Oil Resistant
Scratch and Oil Resistant
Diopter correction (dpt) more than +/-2
more than +/-2
Pressure tested to what pressure 1m for 30 min. (IPX7)
1m for 30 min. (IPX7)
Storage temperature
-40°~158°F
-40°~158°F
Functional temperature
-13°~140°F
-13°~140°F
Frame material Magnesium
Magnesium
Internal gas purged Nitrogen
Nitrogen
Tripod Adaptable Y/N Yes Yes
Origin Japanese components assembled in the US
Japanese components assembled in the US