6. Setting the Film Speed
While pressing the lock release button, rotate the film speed dial until the ISO/ASA of your film is aligned with the green index. This is necessary for getting correct exposure.
A film's ISO/ASA number (for example, ISO/ASA 100) represents its sensitivity to light. The higher the number, the less light needed for an exposure. Thus, with ISO/ASA 400 film you can shoot even in dim light.
(Figures in parentheses are intermediate film speeds represented by dots on the film speed dial )
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