Quote:
Originally Posted by Alter_ego
Also, on page 30 of the 580ExII manual, it states that "with Auto external metering, the camera's ISO and aperture will be set automatically in real time by the speedlight" Would this be beneficial for indoor low light, or weddings, or would it be better to have total control over ISO and aperture?
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I think it's always best to have total control over your medium, so I do not think auto selection of the ISO, aperture and/or shutter speed is a good thing.
The difference between TTL and Auto External Metering:
TTL is "through the lens metering". Camera and flash work together to auto expose, using the parameters or mode your shooting in.
Auto External Metering means the reflected flash is read by a sensor on the flash, which then sends a signal to the processor telling it to cut off after proper exposure is reached.
I've found Auto External Metering of the Metz to be far more accurate and consistent to the TTL of the 550EX and 580EX. (I have not tried the 580EXII, but probably won't due to the lack of wink flash).