Pentax KM KM Manual - Page 16

SHUTTER Turn the shutter speed dial clockwise or counter-clockwise to the shutter speed desired. The shutter speed can be set either before or after cocking the rapid-wind lever. As you cock the shutter by turning the rapid-wind lever, the "cocked" indicator turns to red showing that the shutter is cocked. For use of the X setting (next to the 60) on the shutter speed dial, refer to page 19. With the shutter speed dial set on B (bulb), the shutter will stay open as long as you keep the shutter button depressed. As you release your finger from the shutter button, the shutter closes. For particularly long exposures ("time exposure"), use a cable release with a locking device. '; CAUTION At slow speeds - slower than 1;30 - support your camera rigidly or use a tripod to prevent camera movement. To protect the shutter mechanism, trip the shutter release before putting the camera away for any extended period. 14•