Okay, foot in mouth here. The Sigma is of course P-TTL compatible. Sorry. May I suggest you try a different setup. What happens if you remove the closer object? Will the exposure come out right for the distant object then?
If so, I guess what happens is that the pre-flash decides that burn-out protection takes precedence over focus distance. Jostein 2008/5/22 AlunFoto <[EMAIL PROTECTED]>: > Rick, > The *istD was the last camera to support the old analogue TTL. For TTL > flash with K10D you need a P-TTL compatible flash. > > Jostein > > 2008/5/22 Rick Womer <[EMAIL PROTECTED]>: >> I was wondering why the flash exposures I get with my >> K10D and Sigma EF500 DG Super aren't as reliable as >> those I got in the hazy past with my PZ-1(p) and >> ancient (but TTL capable) Sunpak flash. >> >> So I repeated an experiment I had performed with the >> PZ-1p and Sunpak: I had two targets of similar shade, >> one close (~1.5m) and one distant (~5m) in the same >> ambient light in the same room. Focusing on the near >> target and photographing it led to a perfectly exposed >> near target and underexposed distant target (which is >> as it should be). Focusing on the distant target led >> to a perfectly exposed distant target and overexposed >> near target, even though the two targets had the same >> positions in the frame in the two situations. This >> told me that the PZ-1(p) used distance information >> from the lens in calculating flash exposure. >> >> Last evening I performed the experiment with the K10D >> and Sigma flash. No matter which target I focused on, >> the near target was always properly exposed and the >> distant target underexposed. Thus it appears that >> this camera-flash combination does not use distance >> information in its flash exposure calculations. >> >> It would be interesting if someone with a Pentax 540 >> flash would try the same experiment. Is it the camera >> or the Sigma (reverse-engineered) flash that is unable >> to use the distance information? >> >> Rick >> >> >> http://www.photo.net/photos/RickW >> >> >> >> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. >> > > > > -- > http://www.alunfoto.no/galleri/ > http://alunfoto.blogspot.com > -- http://www.alunfoto.no/galleri/ http://alunfoto.blogspot.com -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
