Q. Based on your review, the new
Sony A77 sounds like a terrific camera. But its design raises questions: The OLED finder sounds excellent, but if there is no optical viewfinder why does the camera need a mirror at all? And, the very definition of a “reflex” camera implies that the user is sighting through an optical path that reflects off a mirror; if that is no longer what is happening, is it correct to call this camera a “DSLR?” Is it time for a new camera designation?
A. The reflex mirror in modern single-lens reflexes, both film and digital, does more than reflect the image up to the prism viewfinder assembly. It also directs light to metering and phase-detection autofocusing modules. In the Sony A77 and its ilk, a fixed, transmissive mirror is used solely for AF and metering. This allows the camera to focus continuously during fast bursts and video capture, as the mirror stays put.
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