triple holder bird spotting scope  outdoor optical telescope 20-60x52ED spotting scope for hunting CL26-0010

Magnification : 20~60X
Effective diameter of objective lens : φ85mm
Objective lens focal length : 530.04mm
Zoom eyepiece focal length : 26.1mm~8.83mm
Objective lens structure : 3/3
Zoom eyepiece lens structure : 7/4
Focusing system : Internal porro prism focusing with dual focusing device
Real field of view : 2°~1°
Apparent field of view : 40°~ 60°
Field of view at 1000m/1000yds :35m~17.5m/105ft~52.5ft
Eye relief :19.6mm~17.8mm
Exit pupil  : φ4.2mm~1.4mm
Twilight factor : 41.2~71.4
Minimum focusing distance : 7m
Zoom eyepiece length : 88mm
Zoom eyepiece weight : 220g
Main body length : 385mm
Main body weight : 1590g