Hi, I need a polarizer for controlling reflections in store windows, using color neg film. ("Accurate" or saturated color is not a goal- I prefer it somewhat su bdued.) Is a linear filter OK/ What's the difference between Kasemann and the ch eaper Heliopan? I'm looking at Robert White's prices. I'll use it on two WA lens es for 6x9 format, the 65/5.6 Super Angulon and the 80/4.5 Super Symmar XL. What adapter would I need? The Lee filter sounds too delicate for my brutish ways with equipment. I tried to find out the diameter of the 80 on Schneider's website and failed. (I have just ordered it so can't measure.) Thanks in advance for advice! Cheers.