Canon A-1 - Manual (Page 132)

ASA to a higher value as described earlier.
In this method, you must first decide how
many exposures you want to make on the
same frame. If a double exposure, make
both exposures at twice the normal ASA;
if a triple exposure, make all three exposures
at three times the normal ASA; if a quad­
ruple exposure, make all four exposures at
four times the normal ASA, etc.
Another way to correct exposure is to use
the exposure compensation dial at the set­
tings outlined in the table below.
Number of Multiple
Exposures Exposure Compen­
sation Scale
Double
Triple
Quadruple
1/2
Between 1/2 and 1/4
1/4
The method when using the exposure com­
pensation dial for this purpose is the same as
that of changing the ASA. That is, for a
double exposure, the dial should be set to
1/2 for both exposures and so on.
Actually, both methods described above are
only general guidelines, and your technique
will benefit greatly from experience.
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