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Setting the ASA Film Speed
The ASA is a numerical rating of a film's sensitivity to light. The higher the ASA rating, the faster the film and the more sensitive it is to a given amount of light as compared to a film of a lower ASA rating. In other words, the higher the ASA rating, the less light you need to expose the film. When buying film, choose one with an ASA rating appropriate for the lighting conditions. The film manufacturer's recommended ASA rating can be found on the film packaging or data sheet.
Since the ASA film speed is one of the essential factors in determining proper ex- posure, it is very important that it be correctly set on the camera. The table on the opposite page shows the ASA ratings which can be set on the
ASA, press in the ASA film speed dial lock button with your fingernail and turn the outer knurled edge of the dial until the desired film speed rating is aligned with the film speed index. The dial cannot be turned lower than ASA 6 or higher than ASA 12800.
There is an exposure compensation scale on the ASA film speed setting dial. The function of this scale will be explained later, but at this point, please note that this scale should be set at “1” for normal AE pho- tography.