Backup mechanical release lever ®
This lever is provided as an alternative method of trip - ping the shutter in case the camera's batteries become weak or completely exhausted . To operate the lever, first use your fingernail to pull it down to the ready position. Then push it down to trip the shutter. The shutter operates at a mechanical speed of approx . 1/60 sec . regardless of the setting on the shutter speed dial. Even when the batteries are exhausted, you can still make time ex- posures by setting the dial to "T" and using the backup mechanical release lever to trip the shutter.
Caution : II you advance the liIm while holding down the backup mecha· nical release lever, the shutter will fire immediately at the completion 01 the film advance stroke, thus wasting a lrame .
Also if you loilto advance the film completely and then use this lever to trip the shutter, the mirror ® will remain in the "up " position until the advance lever stroke is completed.
Depth-of-field preview button CD
This control allows you to get a visual impression of the various parts of the scene in front of and behind the main 25 subject which will appear sharp in the final photograph (see the photos on the next page.) To operate this control, push the button while looking through the viewfinder. If
the lens is set to anything other than maximum aperture, the image on the focusing screen will give you an indi- cation of exactly what will be in focus in the final photo. The image progressively gets darker as the le ns aperture gets smaller.
