
Here’s some additional background as to which exposure mode is best according to the situation at hand:
P (Program AE): With the camera set for fully automatic operation, the camera and Speedlite work together while you concentrate on
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M (Manual): Manual exposure mode lets you control both the shutter speed and aperture. This option is important in low light situations when you want to combine small apertures with high shutter speeds. Keep in mind that manual exposure mode on the camera can be combined with fully automatic flash exposure, since the camera’s metering systems for flash and existing light are independently controlled.
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