A single lens reflex camera including a mirror-slit unit provided between a photographing lens and a recording medium and being provided with a pair of mirrors which can be selectively moved onto an optical axis of the photographing lens, and a slit provided between the mirrors; a ...http://www.google.de/patents/US5715003?utm_source=gb-gplus-sharePatent US5715003 - Single lens reflex camera and exposure method for same
