model

KFS20x80

 magnification

20x

body material

aluminium alloy

rubber material

rubber

color

black

 objective aperture

Φ80mm

eyepiece aperture

Φ24.5 mm

 exit pupil

Φ4mm ± 10%

 eye relief

17mm

(°)FOV

3.3°

 (at 1000M)field of view

58m

(at 1000yds)field of view

174ft

 diopter regulation

·    Right diopter ring

 eye distance

58～72mm

 focusing system

cent

 focusing lens

 eyepiece focusing

  diopter regulation

-4~+4 diopter

 focus range

-4~+8 diopter

 prism system

 porro

 lens material

BAK4

 optical system

Objective lens ：2 pieces 1 group

Eyepiece lens ：4 pieces 3 groups