Canon CANONET G-III L19 How To Use Manual page 9

Film Speed Setting
Immediately after loading f i l m , be sure to
set the ASA film speed scale in the proper
position by pressing the notched film speed
setting lever with your fingernail, matching
the proper film speed number with the index
of the ASA film speed indicator window.
The higher the film speed number, the
more sensitive the film; the lower it is, the
less sensitive. The ASA 200 f i l m is better
for shooting at low light level, than the
ASA 100 film.
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