Large aperture ratio interchangeable lens for a single lens reflex camera

摘要

A large aperture ratio interchangeable lens for a single lens reflex camera comprises a lens body, a preset aperture ring provided for rotation with respect to the lens body, a first signal member operatively associated with the preset aperture ring to transmit a corrected difference signal (f-f.sub.O -&Dgr;f) to the camera body, and a second signal member for transmitting a corrected open value signal (f.sub.O +. DELTA.f) to the camera body.