Combined illuminated reticle and focus knob
Combined telescope and autocollimator
Common-aperture optical system incorporating a light sensor...
Compact binoculars for nighttime vision
Compact high resolution panoramic viewing system
Compact keplerian telescope
Compact night vision device
Compact periscopic beam director
Compact spotting scope with side focus control
Compact telescope
Compact telescope
Compound telescope with a stationary primary objective...
Concentric telescope system
Consumer night vision viewing apparatus
Contaminant removal from telescope optical elements
Convergence value compensating binoculars
Converter for polar-axis telescope
Convertible binocular/stereoscope device
Correct image zoomable reflecting telescope with near...
Cylindrical body of a Newton reflective telescope