Film Speed Setting
Immediately after loading film, 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. For example, the ASA 400 film
is better for shooting at low light level than
the ASA 100 film.