I found that with the DS body that the metering calibration for RAW format capture was off by between .3-.7 EV, no matter what the lighting. In bright circumstances, and low ISO settings, I nearly always needed to add .3EV ... at ISO 400-800 and low light, tungsten illumination, I needed to set .7EV. The K10D does much better in this regard, I'm much more of the time at 0 to +.3EV.
White balance should be of no consequence, although it's possible that changing the white balance somehow affects the metering calibration ... dunno. Although it is true that imaging and metering sensors are more sensitive to light in the red/IR range than in the green/blue range, and incandescent light is shifted way into the red range, so maybe the adjustment to WB could affect it in that way somehow... Godfrey On Aug 10, 2007, at 9:12 AM, Igor Roshchin wrote: > There is one type of lighting where I found it useful to set > the WB manually, while shooting RAW. > > While shooting in low ncandescent light, > if I use the auto white balance, the images turn to be way > underexposed > when the balance is corrected. (this is on *istDS) > It may be possible to do exposure compensation instead, but I haven't > tried this yet. > >> I bought a WhiBal card because there are times when it would be >> useful to have a reliable white/gray/black reference in a test frame >> when I'm doing post processing. I never manually set a white balance >> in the camera, it's a waste of time unless you're using JPEG capture, >> and I only use RAW capture. >> >> If I need to calibrate a camera for accuracy, a gray card isn't going >> to be much use... > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
