Hello all. The other day I got a circular polarizing filter for my D70. I tried it out the other day for the first time, and noticed that I get some vignetting on the photos. I already had a Hoya skylight filter in place and put the polarizing filter on top of it. Is there a way I can get rid of the vignetting without having to take off the skylight filter? Or is it better to just crop the photo after shooting? What do YOU think? Thanks.