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CMS-XML 166A Speedlite : How to set the aperture setting on the Speedlite
To select an aperture set the Aperture/MANU selection switch to the upper or middle position; the aperture value will appear in the Aperture/MANU window. The aperture will change depending on the setting of the ASA film speed. When ASA 100 film is used for instance, the upper position is f /2.8 and the middle is f / 5.6