Canon F-1 Instructions Manual page 34

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1
Focus at the lens' maximum aperture.
2
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.
3
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.
4
To set the exposure, rotate the shutter speed dial or
aperture ring, as desired, until the meter needle
coincides with the meter index.
5
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.
34