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Robin Usagani wrote:
If your camera is in manual (aperture, iso, shutter are set), is flash TTL affected by the metering mode on your camera?
Yes, at least in the case of Canon cameras. The preflash will be read from the same area as the selected metering pattern: spot, center-weighted, evaluative, etc.
For example, if you use spot metering (I often do) you can set the spot over a particular area of the image, press the * or FEL button (depending on camera and settings) to initiate a flash reading and lock in the value, and then recompose and take the shot. That can give a different level of flash output than taking the same shot without Flash Exposure Lock if the two areas that the spot falls on have different exposure values.
Note that in Manual exposure mode, ETTL Autoflash will try to light the metered subject to a middle gray EV.
Edited on May 30, 2013 at 09:09 PM · View previous versions