My Sony VW11HT with CC40R filter has been looking below par for quite a while. Its been looking dull, no snap, and even the Stewart Greyhawk screen didn't seem to do much to help the poor contrast. Anyway, I removed the CC40R filter as an experiment, and boy am a glad I did! When I originally added the filter and calibrated with SMART, I was sure it helped enormously. But the lamp has aged and is obviously kicking out fewer lumens making the filter a complete over-kill. I now have a wonderfully vibrant picture again with more satisfactory viewing even with a little ambient light (thanks to the grayhawk screen). So if you've added a filter early in your projectors life, it might be time to remove it!