
1) Camera feature
Found on
https://www.crosswordclues.com/clue/motor-drive

A motor drive, in the field of photography, is a powered film transport mechanism. Historically, film loading, advancing, and rewinding were all manually driven functions. The desires of professional photographers for more efficient shooting, particularly in sports and wildlife photography, and the desires of amateur and novice photographers for e...
Found on
http://en.wikipedia.org/wiki/Motor_drive

A battery-powered mechanism that advances the film to the next frame and recocks the shutter. Popular for action-sequence photography and for recording images by remote control
Found on
http://www.encyclo.co.uk/local/21048

A battery-powered mechanism that advances the film to the next frame and recocks the shutter. Popular for action-sequence photography and for recording images by remote control. A mechanism for advancing the film to the next frame and recocking the shutter, activated by an electric motor usually powered by batteries. Popular for action-sequence pho...
Found on
http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl

a mechanical system, including an electric motor, used to operate a machine or machines.
Found on
https://www.infoplease.com/dictionary/motor-drive
No exact match found.