Originally posted by stevebrot As noted above, color space on import to your software can result in huge on-screen differences. The rules of thumb are
Capture at a wide gamut color space (Adobe RBG on your K-3)
I believe that this doesn't make any difference. The RAW files have the same color information either way - which (fortunately) is broader than even ProPhoto RGB. It only affects the color space in the JPEG files, giving you JPEG files that are less colorful and odd for most purposes, since (as you noted) sRGB is the assumed color space for most JPEG applications.
If you're going to shoot JPEG-only
and PP them all later then AdobeRGB could give you a little more color to work with. But this is an unusual scenario, so sRGB is a more practical camera setting in most cases.