Magnification:8x
Objective lens diameter(mm):40
Exit pupil diameter(mm):5
Relative brightness:25
Twilight factor:17.9
Eye relief(mm):16
Field of view,real(degree):8.0°
Field of view,apparent(degree):64°
Field of view,real(m / 1000 M ):141M
Field of view,real( ft / 1000 yds):423FT
Close focusing distance(m):4.5
Diopter compensation(dpt):±5
Interpupillary distance(mm):58-72
Focus system:Center
Prism system:Porro
Prism glass:K9
Objective lens structure :2 elements/ 1 groups
Eyepiece lens structure:3 elements/ 2 groups (aspherical lens)
Lens and prism coating:MC
Eyecups style:Twist-Up
Waterproof:Water :Resistant