--- R Sriram <[EMAIL PROTECTED]> wrote:
<snip>
> When I was shooting indoors
> with a 200/2.8L, I
> used A=f/5.6 and T=1/200s and let E-TTL do its bit.
> I noticed that
> after a while, the camera suddenly showed me a
> 1/1000s shutter
> speed. When I AF'd and shot, it dropped back to
> 1/200s. 

If the flash isn't ready to fire, the camera will base
its exposure on ambient light... I think all EOS
behave this way. If you set a manual exposure via the
M mode, the camera will "fall back" to that setting
until the flash is charged and ready to fire. If the
camera detects a shutter speed too high for flash sync
when the flash IS ready to fire, the camera will set
it to a proper X-sync setting based on how the custom
functions are set.

Nothing weird about it at all. If it didn't act this
way, you'd have a lot of dark/black photos (no flash),
or big black bands in the photo (from the shutter not
being fully open) when the speed exceeds X-sync. You
know, like we used to have to deal with before cameras
became smarter than photographers. :-)

MadMat

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