Bird-watching monoculars 15-45×50/20-60*60 variable HD high low light telephoto viewing glasses

Overall structure:Monocular telescope
Product type: Magnifying telescope
Objective lens diameter (mm): 50、60
Instrument magnification times: 15x-45x
Exit pupil diameter (mm): 1.5-4
Exit pupil distance (mm): 17-13.5
Resolution arcsecond: 6.8
Focal length (mm):100、120、130
Specifications:15-45×50 target lens、20-60X60 flat angle target lens、20-60X60 oblique viewing lens