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 Fluorite Fluorite
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