Light shielding device in single lens reflex camera

摘要

A reflex mirror for reflecting light from an objective lens to a penta prism is provided with a light-permeable portion for conducting part of the light to behind the reflex mirror and with a shutter plate for shielding this light-permeable portion. When the reflex mirror reaches an exposing position after being moved from a viewing position, the shutter plate comes into engagement with a member and it takes a light-shielding position. This member is made adjustable in position, thereby enabling achievement of an accurate light-shielding position of the permeable portion by the shutter plate when the reflex mirror is in the exposing position.