Originally posted by ManuH I think it would be nice to see pictures examples of these overexposures. When someone is telling me that it overexposes in TAv I take that with a big grain of salt. The K-5 allows for a huge ISO latitude (by default up to ISO 12,800), could it be that people are set on a too high ISO not allowing the flash to throttle down enough? The "not under all conditions" is suspicious too, that's why seeing the pictures may help to understand what's going on.
Manuh, these flash issue reports were suspicious to me too, because at the beginning I did not have any issue with flash. Then after some days of use BAMM! I also ran into this issue.
It's really bad because so far it seems to be totally unpredictible, I get decent pics one day then get totally overexposed (like 2+ stops) pics next time. I even had a case when within 1 hour some shots were ok (no flash issue) and some others overexposed - using exactly the same settings (M mode, f4, 1/80s, ISO200) and same ambient light level in the same room indoors.
I couldn't find any pattern so far, it doesn't seem to matter what exposure settings I use, the flash issue may pop up and vanish.
As I recall someone from Pentax support told it's a communication issue between the cam and the flash, i.e. the cam may not send all (or the proper) info to the flash in the hotshoe and therefore the flash may use full power. Wireless flash not being affected by this issue also suggests that it's probably a hotshoe communication issue. So I guess this is just a bug in firmware and could be fixed in new firmware.