Loman, I like my symmar-s for image quality, but it is the newer 105mm type (f5.6) and filters cost too much. Take a look at a 105mm polarizer some time! I found some surplus WWII filters which fit perfectly (when used with black electrical tape). They are just glass without the threaded metal rim, but are the exact size of the front lens metal's outside diameter. It is a wonderful lens and I now have a plain glass, yellow and red filter for it, complete with the military surplus wood box they came in with olive drab paint. tim