Illuminated aiming device for an observation instrument
Image intensifier binoculars
Image-erecting viewing optical system
Image-inverting prism device with double uses for a telescope
Imaging optical device, in particular binoculars or telescope
In-ground telescope with a stationary primary objective...
Infrared catadioptric zoom relay telescope
Infrared catadioptric zoom relay telescope with an asperic prima
Inner focus type telescope
Interconnection of zoom operating member and zoom drive member
Interpupillary distance adjusting mechanism for use in binocular
Interpupillary distance adjustment mechanism for optical device