Larry, what you describe is not how P-TTL works.
You would have to try hard to notice the pre-flash of the P-TTL.
THe interval between the pre-flash and the flash is just at 
the border of what a human eye can resolve.

What you describe sounds like a red-eye-reduction mode.
But even for that, - the first "short wait" is strange
(unless it's due to focusing or due to the battery still charging up
for the pop-up flash, if the shot happened too soon after you popped it
up).


Igor


Wed Aug 11 18:58:27 CDT 2010
Larry Colen wrote:

> Rather than my usual habit of using the flash in manual mode, I was
> using it in TTL, and I noticed that there was what seemed like a two
> second shutter lag. Press shutter, short wait, flash, long wait,
> click/flash.  Is this normal? I've never noticed such a long delay
> between the first and second flashes before.  The batteries weren't
> desperately low, but they weren't completely fresh either.


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