Mon Nov 29 16:00:51 CST 2010 Dario Bonazza wrote: Charles Robinson wrote:
> > On Nov 29, 2010, at 14:46, Dario Bonazza wrote: > >> > >> Is [11. WB Adjustable Range] in the [C Custom Setting 2] menu set to > >> [Fixed]? > >> > >> If not, that could explain that behaviour. Don't ask me why one > >> should > >> select a given white balance and then allow the camera to change it, > >> but > >> Pentax thinks of it as a good idea! > >> > > > > Isn't this all about being able to fine-tune all of the WB settings? > > Not > > the camera doing it, but the user making adjustments. > > K-7 manual, page 192: > > "The camera automatically performs fine-tuning even when the light > source is > specified. The color temperature of the light source is fixed when [11. WB > Adjustable Range] in the [C Custom Setting 2]] menu (p.85) is set to > [Fixed]." > > AUTOMATICALLY, even when the light source is specified. > > Perhaps there are instances where such operation makes sense, but... to > me, > it looks a lot like that mad idea of allowing you to select SEL for AF > points selector and then reverting back to auto select, which was the > behaviour of the AF selector before a firmware fix. > > Dario Dario, I think you are right. I just checked the menu settings, and it was set to the default value, "Adjustable Range", instead of "Fixed". I suspect that this setting was the culprit for what I observed. Thank you to all who responded with the ideas and suggestions! Some clarifications and comments to responses: Even though in the thumbnail list I showed, most of the shots were with the yellow cast, as I wrote earlier, - most of the shots (about 800 shots) were without this yellow cast. I just chose the part where the dancers were exactly in the same spot, so that it would be obvious that the light conditions didn't change at all. For the sake of completeness: the setting c2 -> 12 "AWB under Tungsten light" was set to "Subtle", but I suspect this is only relevant to when the WB is set to AWB. At least the manual (page 85) says so: "12. AWB in Tungsten light. Sets whether to leave or adjust the tungsten light color tone when the white balance is set to _AWB_." Bob and Boris: I usually shoot with AWB (and RAW), but this time I fixed it the WB to minimize necessity for corrections, as the light was very consistent and the flash was not allowed at all. Joseph: It's a hotel ball/meeting room (Omni) rented for the event (the wooden floor is rented/installed on top of the carpet). Bob and Charles, - Mark is correct, - it is definitely tungsten. (I saw the bulbs, and checked the WB initially, when I started shooting) Joseph: I saw that the actual WB of the shots was changing as I was shooting (I didn't discover it later), but I didn't bother to start changing anything during the performance. There were two reasons: it was shot in RAW anyway (hence I knew I could correct it later), and I didn't want to miss something interesting. Besides, at the time I had no idea what else might affecting the WB. A rather interesting thing is that the yellow cast in these shots is not as redish as the one that would have been if I left the WB set to AWB. Again, thanks to all who responded. Igor -- 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.
