I took some test shots using same settings except some shots were made in AF-S focus mode and other in MF: ISO 200, multi-segment metering, +1.0 flash exposure compensation, 1/180 s exposure time, F5.6. I got different kind of results. Some of them (that were shot using AF-S), were significantly lighter than most of the others. The object is a white door. Sample images are in the web temporarily:
I hope the inconsistency is not due I used Starblitz 3600BTZ TWIN flash with the camera few times. I later measured its trigger voltage 53V (and temporarily significantly higher). I wish I had been warned about the possible too high voltage beforehand. On the other hand, I have not heard anybody had broken his/her DSLR by too high flash trigger voltage. Can anybody else make similar test shots by K10D?
I hope external flashes give more consistent results in P-TTL mode.