On Fri, 16 Feb 2001, marc de witte wrote:
> Hi all,
>
> Perhaps a silly question about using compensation with my 50E + 380EX
>
> I want the background underexposed by 2 stops but want the subject
> exposed correctly.
> So I set the exposure compensation on -2 and the flash compensation on
> +2.
> Correct ?
>
> Thanks for your input.
In theory, no. Flash and background exposure is handled individually. So
if you set -2 for exposure compensation, that only affects background.
Similarily, flash compensation only changes the flash exposure. So, you
just set -2 for exposure compensation, and leave flash compensation to 0.
As the flash exposure (E-TTL) and background (evaluative) is handled by
the same exposure system... the background exposure can sometimes be the
exposure of the subject without flash (not quite the same thing as the
exposure of the background in some situations). The flash is always
exposed according to what ever the camera thinks is the subject. And it
could be filling the entire frame. What could the camera then think to be
the background? Ah, but this is getting a bit too complicated... maybe in
some macro situations when you might be using manual exposure you should
think about this... generally just remember the above. They are handled
independently. (And the way you are asking, background -2 + subject +-0,
it works just like that.)
Best regards,
Hugo.
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** Hugo Gävert **
** [EMAIL PROTECTED] http://www.hut.fi/~hugo **
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