ffrowe

thanks for all your collective help!

so... when I took photos at the same gym a week later (see below) and my colors were more consistent, it probably wasn't because I was using a custom WB, but instead was because most of my photos were taken at 1/250 sec (a slower shutter speed)?

Here's the most illuminating (no pun intended) information I found at SportsShooter:

http://www.sportsshooter.com/message_display.html?tid=20873

Speaking of custom WB, no one has specifically stated this, but I'm assuming that it's important to set your shutter speed to 1/60 or slower when setting the WB, to capture the full cycle of the lighting. (am I right?)<div></div>

Really? I've never heard of such a thing.

(How is it that I avoided this problem for the first 18 months that I owned the camera?!)

I'm attaching a series of five photos to illustrate the problem.

Note the changing colors of the floor and the back wall.

All of these were taken at 1/350 sec, f/2.8, ISO 3200, with White Balance set to Tungsten.

Do you really think it's caused by what you've described above?<div></div>

I own a Pentax *ist DS.

Lately I've been seeing strange behavior related to white balance (WB).

For example, with the camera set to the tungsten WB setting, if I take several

photos of the same object in succession, I end up with a variety of color

casts. One photo will be too warm, the next too cool, the next "just right",

etc. These are not subtle variations; they are substantial.

I first noticed this problem with the tungsten setting, but I was able to work

around the problem by doing a Manual WB adjustment.

But now I'm starting to see the problem even with Manual WB.

Has anybody else had this problem??

Any idea what's going on, and what I can do about it?