Electronic still photographic adaptor mountable single-lens refl

Exposure and view finder orientation switching mechanism for a c

Field frame changeover mechanism for viewfinder

Field frame for finder

Field frame switcher

Field-of-view frame switching device

Finder

Finder and camera using such finder

Finder field-of-view frame switching mechanism

Finder optical system

Finder optical system

Finder system of a single lens reflex camera

Finder visual field changing mechanism

Finder visual field switching mechanism

Foldable mask for camera viewfinder and method of using same...

Image frame changing apparatus for camera

Inverted galilean type variable magnification zoom finder

Lens-fitted photographic film unit with picture frame size chang

Method and apparatus for controlling privacy mask display

Mirror adjustment method and apparatus