cgw
Been spending a lot of time on here!
Always thought the value of the F3's "mechanical" shutter option was moot. Anyone who uses these regularly either swaps out the battery and/or carries spares or uses an MD-4.
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Actually Fred you could use the F3 without a battery. You were limited to 1/60th of a second.
Backup mechanical lever
This lever is provided as an alternative method of tripping 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. at any setting on the shutter speed dial except "T." At "T," the shutter remains open until the dial is turned to another setting.