Nikon F3 High-Eyepoint - Backup Mechanical Release Lever; Depth-Of-Field Preview Button

Backup mechanical release lever ®
This lever is provided as an alternative method of trip-
ping the shutler in c ase 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 shutler. The sh utler operates
at a mechanical speed of approx . 1160 sec. at any setting
on the shutler speed dial except "T." At "T," the shutler
remains open until the dial is turned to another setting .
To conserve batlery power, it's recommended to use the
backup mechanical release lever to trip the shutler at
"T." Turn the power switch off, and make sure the LCD
shutler speed is off before tripping the shutler. This
prevents batlery drain.
Caution: If you odvance the film w hil e h olding down the backup me cha-
nical release lever, the shuller will fire immediotely at the completion
of the film advonce stroke, thus wasting a frame.
Also if you fail to advance the film completely and then uSe this lever to
tnp the shulle r, the mirror ® will remain in the "up" position until the
advance lever str oke is compl eted.
Depth-of-field preview button CD
This control allows you to get a visual impression of the
various parts of the sc ene in front of and behind the main
subject which will appear sharp in the final photograph
( see the ph otos on t he next page. ) To o perate this co ntrol,
push the butlon while looking through the viewfinder. If
the l ens is se t 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 lens aperture
gets smaller.
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