Pentax 645 645 Manual - Page 22

C/S SWITCH, MAIN SWITCH AND SHUTTER RELEASE BUTTON Lo2J IN • 000 The Pentax 645 incorporates a motor drive unit, permitting either single or consecutive shooting through the C/S switch. Select either the C or S position by turning the C/S switch. • Single frame shooting (S) By depressing the shutter release button, a single frame is exposed and automatically wound to the next frame, at which point the motor halts. • Consecutive shooting (C) While the shutter release button is kept depressed, the frames are continuously exposed at about 1.5 frames/sec. Once finger pressure is released from the shutter release button, the motor will halt after winding the film to the next frame. 20 • Main switch and shutter release button A light pressure upon the shutter release button with the main switch turned ON will immediately activate the exposure meter causing the LED indicator to appear in the viewfinder of the camera; further pressure on the button will release the shutter. A timer switch has also been integrated into the exposure meter circuit, and will automatically terminate power approximately 30 seconds after finger is removed from the release button. • Turning the main switch off during exposure will result in incorrect exposure.