drawing cross-section old retro prewar vintage medium format 120 analogue twin lens reflex film camera

camera lighting gadget old retro vintage glass isolated white background open ready work name exist nowadays analog equipment lens metal optics shutter aperture prewar viewfinder 20th century construction antique simple small film drawing popular black thirties prints paper light darkroom traditional format manufacturers analogue reflex rare negative body apparatus system medium 120 twin rollfim viefinder shoot two lenses cross-section cross background shoot name technical profile review cut