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CMS-XML 155A Speedlite : How to set the aperture setting on the Speedlite
For example the AUTO/MANU switch is set at the red position, the f/stop below the red aperture index mark is used for AE flash photography. The f/stop will change depending on the setting of the ASA film speed. In the case of ASA 100, the red position is f /2.8 while the green position is f / 5.6