I cheaped out on my last circular polarizer and bought a Sunpak for my new Sigma 18-200 OS and am not pleased with it compared to my other Quantaray Professional circular polarizer for my 50mm I have. Now Im looking into getting something really nice since I do alot of work with a polarizer and I was looking into the Singh-Ray Gold n Blue polarizer. Can anyone who has used this filter give me any input on this? Is it a good all around polarizer filter to use all the time outdoors or would I just be able to use it shooting landscapes and such? Is it worth the $180 price tag? Everything I have read about this filter has been great but I wanted to see what you guys said before I pulled the trigger. Thanks!