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The 645 has a built-in 1.5 frames per second motor drive, center-weighted TTL metering, multiple automatic exposure modes, and a small LCD screen on the top plate. This screen will indicates mode, exposure compensation, and exposure count. Unlike comparable medium-format cameras, the 645 does not have an interchangeable back system. Instead, the film is loaded into holders, which are then inserted into the rear of the camera. The holders cannot be removed until an entire roll is shot. The crop factor vs. a 35 mm camera is .62.