Canon A-1 - Manual (Page 137)

field looking at the image through the
viewfinder by pushing in the stop-down lever
just as in stopped-down AE photography
and setting the lens to the working aperture.
This will probably be one of those occasions
when you will release the stop-down lever
and return the lens to “A” before taking a
shot. You will have to operate the multiple
exposure lever as explained earlier before the
camera
will properly operate. See
WARNINGS OF INCORRECT OPER­
ATION IN STOPPED-DOWN PHOTO­
GRAPHY, p. 64.
V - -
Small Aperture
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77
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Large Aperture