R, I should have said in my first note that I also don't use or carry color-balance filters. Photoshop does those perfectly with NO optical flaws (eg reduction of resolution, contrast-reducing glare, scratches, etc.). BTW, I use Color Balance (Control- for slight color rebalancing equivalent to the 81-series warming filters. About 5 points each of red and yellow duplicates the 81A, about 10 points each for a 'B', and 15 points each for a 'C' work well for me. Do the opposite if you need to 'cool' an image. Of course, PS's Camera Raw fixes the color-balance errors while converting images.