Hello Tanya, I think the jury is still out on this one. You have two different issues for the *istD. First is P-TTL. This is the latest type of TTL from Pentax. It was introduced when the MZ-S was released. This emits a preflash that is measured before the main flash. Supposedly it is more accurate and renders more natural looking images. Then there is digital TTL from the FTZ flashes (AF330FTZ, AF500FTZ) and analog TTL from the older (Af280T, AF400T) units. I don't know which one your Sigma's are, but if had to guess, I would think that they are digital TTL like the AF500FTZ.
I haven't done enough flash stuff yet, nor seen enough on the web from others to make a good determination as to how well the flash system is working. One thing the AF360FGZ does with the *istD is high speed flash synch for daylight fill. The AF360FGZ can be programmed to compensate the exposure, so I normally dial in about -1 to -1.5 stops of light. So with that setup, you can shoot at ANY shutter speed up to 1/4000 in daylight and have the flash fill in the shadows a bit and put a catchlight in the subject's eyes. One interesting difference with the *istD (or any DSLR for that matter) is that it has a narrower latitude than print film. Coupled with the ability to quickly and cheaply test, more is explored on it and it's behaviors than previous film cameras. One wonders if there has always been a few exposure issues with flash systems that is largely hidden by the latitude of print film. -- Best regards, Bruce Tuesday, January 6, 2004, 12:36:56 PM, you wrote: TMP> On Tue, 2004-01-06 at 17:04, Heiko Hamann wrote: >> OTOH - you now can predict the TTL-behaviour of the *istD and use the >> ISO setting for flash exposure compensation ;-) TMP> Frits wrote: TMP> Yes, I thought about this as well, flash compensation is something I TMP> badly miss on my PZ-1, so now I have it on the *ist D. That would mostly TMP> be used for fill-in flash I guess. TMP> Yes, but you wouldn't NEED it if the TTL was working properly to begin with. TMP> This is quite a major consideration to me as one of the main reasons that I TMP> *want* to get the *istD is so that I have a compatible flash system to go TMP> with the body. I have been using the Oly with my Sigma 430st and 500st TMP> manually, and have been quite happy with the results, so if the *istD TMP> doesn't work properly in TTL, makes me wonder if I will race out and buy one TMP> as quickly as I thought or maybe wait for something *better* as I have been TMP> thinking of doing anyways... TMP> tan.
