Blade type focal plane shutters

摘要

The blade-type focal plane shutter formed with a plurality of telescopically operating opening blades movable in front of a film gate. A drive lever for the opening blades is operatively connected to said opening blades and carries a diffusedly reflecting mirror which before the commencement of the exposure operation lies in front of the opening blades in the film gate and is movable out of the film gate during the opening movement of the opening blades. The mirror together with the opening blades forms a reflection factor which corresponds to the mean reflection factor of different film types.