Canon A-1 - Manual (Page 71)

may be better to use the exposure memory
switch as explained on the next page or
manual override.
The exposure compensation dial can also be
used to correct exposure in multiple ex-
posures as explained later.
Usable Range of Exposure Compensation
Dial According to ASA Rating
ASA6:
1/4••1/2••1
ASA12: 1/4••1/2••1••2
ASA25-3200: 1/4••1/2••1••2••4
ASA6400: 1/2••1••2••4
ASA12800: 1••2••4
Once you have made an exposure correction
on a specific frame using the exposure com-
pensation dial, do not forget to reset the dial
to its original setting. Otherwise, all follow-
ing frames will be incorrectly exposed.