Alibaba China supplier bird spotting scopes Magnification : 20~60X
Effective diameter of objective lens : 85mm
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 :4.2mm~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
![](https://bsg-i.nbxc.com/uploads/4e/2f/46/addd5642124a965d0eb11b461a.jpg)
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![](https://bsg-i.nbxc.com/uploads/59/19/e4/438b753aacc058e40f954c394a.jpg)