Quote Originally Posted by pgomena View Post
No, you can't stack a bunch of them. I don't often stack filters, and if I do need to add a yellow to a polarizer, I just do it and move on. No one has ever looked at one of my prints and said "Oh, you must have stacked two glass filters on this one."
For what it's worth, my post about stacking was related almost solely to stacking color correction filters for E6 studio work, where you might have two or three filters stacked to equal say 5Y and 7.5M (5.0M+2.5M). It's not common to need to stack a large number of filters outside that kind of use, although a lot of landscape photographers have gotten into the habit of doing 2 grads + polarizers, etc.