When I bought my Pentax K200D (which I no longer have) I also purchased a Sigma EF-530 DG ST flash. Worked fine on the K200D. Works fine on my Pentax Q, and on my ZX-L. Does not work on my K-5. Anyone with any similar experiences, and should I assume that this is an inherent incompatibility with this flash model and the K-5, and that I need a new flash?
---------- Post added 12-01-14 at 02:34 PM ----------
I should mention I also checked this "Pentax P-TTL Flash Comparison" site:
The Definitive Guide - Pentax P-TTL Flash Comparison
Under "Sigma Dedicated P-TTL Flashes" it mentions, "It's possible that the current Sigma flashes may need similar updates for future Pentax models, but they operate just fine out-of-the-box with the K-r and K-5." What's not clear to me is whether "current Sigma flashes" refers to the EF-610 series or also includes the EF-530 series (it does explicitly talk about the EF-500 needing a firmware update from Sigma to work properly on bodies from the K-10D and newer).