Mirror Lock-up.- -.--When the camera is mounted on a tripod for copy work or telephotography atlong (slow) shutter speeds, the small amount of vibrations due to”mirror-bounce”,which normally are of no consequence, may cause blurring of the image due tothe high magnification encountered in extreme close-ups and telephotography.Mirror shock can be eliminated by locking the mirror in the up position beforemaking the exposure.1. To lock the mirror up, merely move the mirror lock-up lever (23) backwards,until it is horizontal (the lever may be lowered either before or after cocking thes h u t t e r ) .2. With the shutter cocked, release the shutter with a cable release. Afterreleasing the shutter, you may wind the film advance crank with the mirror stilli n t h e u p p o s i t i o n i f y o u w i s h .* Return the mirror to its normal position immediately after completing all ofyour mirror lock-up photography.*When using the 70mm f/2.8 lens (w/between-the-lens shutter), be sure torefer to the instructions packed with the lens.5 1