Stop-Down Exposure Measurement - Nikon F2AS PHOTOMIC Instruction Manual

STOP-DOWN EPOSURE MEASUREMENT
With some Nikkor lenses, full-aperture exposure measurement
is not possible, either because the lens has no automatic dia-
phragm, or because the lens does not couplewith the finder's
meter;with certain accessories, too, lens/finder coupling is not
possible, thus, preventing fullaperture measurement. However,
the camera's Photomic meter can still be used for exposure
measurement via the stop-down method. Before mounting the
lens (or accessory) on the camera body, push the meter cou-
pling lever up and to the right; with this action, the lever will
remain locked up for stop-down exposure measurement (to
release the lever after removing the lens/accessory, push the
release to the right as described in "Coupling Lever Lock/
Release Operation" on page 39). After setting the finder, mount
the lens or lens/accessory combination on the camera, switch
on the meter by moving the film-advance lever to the standoff
position, and then set the controls for correct exposure as fol-
lows:
For automatic diaphragm lenses with no coupling ridge,
set the camera to the desired shutter speed; then, depress the
depth-of-field preview button to stop down the lens diaphragm
and, while holding the button depressed, adjust the aperture
ring until the center LED indicator comes on. Be sure to re-
lease the depth-of-field button prior to making the exposure.
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