Speed flash anomaly
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05-02-11, 05:41 PM
Join Date: Jul 2009
Location: North Herts
in AV mode the camera will meter for the ambient light only, this means indoors you will get a long exposure with the whole room (depending on your metering) correctly exposed, the flash will then expose for a subject in that scene, say a person, as if it was using fill-in flash.
In auto mode your camera selects a shutter speed based on the flash sync so typically 1/60 or 1/125 & then uses the flash TTL to correctly expose the scene.
Try switching to manual & selecting 1/125 & then use your aperture to control how much ambient light you want in the shot.
You'll also find the flash exposure is different depending on what exposure mode you are on, so on matrix, area or whatever it's called, it thinks you want the whole frame correctly exposed, on spot or centre it thinks you only need the central subject exposed so the background will be much darker.
The thing to do is to try all the different settings to get to know how your flash meters the scene & what difference it makes to shutter speeds & apertures.
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