FIELD: photographic equipment. SUBSTANCE: stop aperture fixing mechanism has electromagnet whose armature is fastened on spring-loaded dog engageable with ratchet-and-pawl gear connected via step-up gear made from toothed gears with tracking member provided with drive and mechanism of adjustment of speed of tracking member motion made in the form of cam rigidly attached to shaft of camera drive and pivotally connected to body of rocker arm engageable with cam and pressed by spring against profile of cam and tracking member. Spring-loaded lever of lens is used as tracking member drive. Spring-loaded dog of ratchet-and-pawl gear is mounted for disengagement from it by magnetic field of electromagnet. EFFECT: enhanced operating reliability. 1 dwg
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