Focus at the lens' maximum aperture.
Set the camera for stopped-down metering by setting
the multi-purpose lever lock to "L" and pushing the
multi-purpose lever towards the lens mount. The multi-
purpose lever will lock in that position.
Turn the meter switch "ON". Only the meter needle
will appear in the viewfinder. The circular aperture
lever will have disappeared from the field of view.
To set the exposure, rotate the shutter speed dial or
aperture ring, as desired, until the meter needle
coincides with the meter index.
Press the shutter button for exposure.
Stopped-down metering is also necessary whenever an
accessory is inserted between the camera and any lens
for increasing the lens' focal length or for increasing lens
extension for close-up shooting. The only exceptions
to this rule are the Extension Tubes FD-U and Extender
FD 2X-A which allow normal full-aperture metering
with an FD lens. If the accessory used is manual, it will
be necessary to set an FD lens for manual diaphragm
control before stopped-down metering is possible (see
pp. 27-29).
An FD lens is designed for full-aperture metering when it
is mounted directly to the F-1 with no accessory
between. If you wish to do stopped-down metering
when the lens is mounted directly to the camera, the
lens must be stopped down to at least f/2.8 or there will
be a possibility of exposure error.
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