I've noticed that when I crank up the ISO in low light situations for sports photography (which requires higher shutter speeds) I get a green/red color shift across some images. One image will be reddish, the next greenish, and then some are a smear of both colors.
I've adjusted through all of the white balance menu options from tungsten to flourescent, etc, and nothing seems to matter.
is there some mystery setting I'm neglecting or should I be concerned about my 5D.
currently unable to post examples, but would appreciate any input you can offer.
Typical situation: ISO4000 at shutter speed of 1250 or so. Very grainy with color shift beyond usable levels.