OPTICAL VIEW FINDER OF PERMANENT SIGHTING Russian patent published in 2010 - IPC G03B13/02 G03B13/14 

FIELD: optics.

SUBSTANCE: optical view finder of permanent sighting for single-lens mirror camera, excluding disappearance of photographed object image in view finder for the period of exposure. View finder comprises mirror roof-like surface as pentaprism, which consists of separate mirrors and includes rotary mirror that recovers image, having possibility of rotation around horizontal axis synchronously to lift of camera mirror. Operator observes photographed object through view finder eyepiece, light filter that matches ocular component, serving for adjustment of linear magnitude and accommodation of operator's eye, inclined mirror, rotary prism and view finder lens. View finder lens is connected to camera lens so that their focusing is synchronous, and rotary prism in process of view finder lens focusing is turned by an according angle for compensation of parallax.

EFFECT: prevention of photographed object image disappearance in view finder, provision of observance over object in process of camera operation with previously lifted mirror.

3 cl, 2 dwg