Variable format viewfinder

摘要

A viewfinder for a camera includes a front masking portion and a movable rear masking portion for providing multiple frame-defining formats in a viewing area. According to the invention, the front masking portion includes a pair of independently movable masking plates which are separately attached to the rear masking portion by a pair of cam follower levers which allow one of the front masking plates to move into the field of view of the viewfinder when the rear masking portion is moved a first increment and to move the other front masking plate into the viewfinder field of view when the rear masking portion is moved a second increment. An overcenter spring assists in effecting each of the format defining positions.