Alex wrote:
> "The camera calculates flash exposure differently
> in E-TTL, and the concept of an arbitrary flash-fill ratio does not apply."
>
> So, does that mean that a 420EX in ETTL mode (as it always is on an Elan 7),
> does NOT automatically choke the flash output in bright light? And if it
> does, how on Earth are we supposed to know what kind of light is "EV 13" or
> above?
I believe what this means is that the exposure calculation made by E-TTL with
flash is not the same as simply deriving a flash setting based on guide numbers
and a flash-to-ambient light ratio. In other words, the camera calculates the
appropriate amount of flash needed for a balanced fill, but not using
"traditional" calculations.
If the camera did not turn off the flash at an appropriate point, all flash
exposures would be at full power, wouldn't they? I don't think I've used an
external flash on my 7, but I can attest that with the built-in flash a
compensation setting of -1 can produce a result in which the fill is effective
yet it is difficult to tell that flash has been used. I can't say that I've been
able to see the interaction of the auto-fill compensation and my user-selected
compensation, but it's still rather unfortunate that the 7 doesn't offer a
custom function to turn off auto reduction of fill flash, which is available on
the EOS 3.
fcc
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