Or red-eye reduction!
Nick
-----Original Message-----
From: "Don Sanderson"<[EMAIL PROTECTED]>
Sent: 11/09/04 14:59:31
To: "[EMAIL PROTECTED]"<[EMAIL PROTECTED]>
Subject: RE: flash for istD
On my flashes the "pre-flash" in virtually undetectable to the eye.
The several flashes in a row thing is either:
Hi shutter speed sync, it exposes a "strip at a time" when shutter speeds
faster than X sync speed are used. Pretends to be a constant light source
like the "modeling flash".
or
Autofocus assit burst.
Don
> -----Original Message-----
> From: frank theriault [mailto:[EMAIL PROTECTED]
> Sent: Saturday, September 11, 2004 8:12 AM
> To: [EMAIL PROTECTED]
> Subject: Re: flash for istD
>
>
> On Sat, 11 Sep 2004 08:38:03 +0100 (BST), Kostas Kavoussanakis
> <[EMAIL PROTECTED]> wrote:
>
> >
> > It has been covered before. The flash Prefires (my mnemonic, not
> > necessarily what the P means), the camera TTL-measures and takes the
> > picture with a second flash, adjusting flash duration as per the data
> > in the prefire.
> >
> > Or so I think.
> >
>
> Thanks, Kostas,
>
> So when I see Big Fancy Flashes of Big Fancy Cameras that flash
> several times in rapid succession before the actual flash, that's
> P-TTL in action? I did not know that. Now I do.
>
> A couple of thoughts:
>
> 1) Wow, that must really suck juice!
> 2) I presume, then that when one hits the shutter release there must
> be a delay of about a second or so to the exposure? and,
> 3) One certainly is letting everyone in close proximity to the camera
> know that they're about to get their picture taken! <vbg> (not that
> that's always a bad thing, just that it wouldn't be very good for
> candids - for group or posed photos, it would be no problem)
>
> Thanks again!
>
> cheers,
> frank
>
>
>
> --
> "It's about time we started to take photography seriously and treat it
> as a hobby." -Eliott Erwitt
>
