I've been using an inexpensive Lee filter with a Gel-Snap holder for color correction. I like the color correction, but find the Gel-Snap system very slow to use. I've got 3 AIS manual focus lenses and anticipate buying a 4th one. I have 180mm f2.8 (72), 20mm f2.8 (62), 50mm f1.8 (52) and plan to buy 20mm f3.5 (52). I want something that I can leave on when walking around and be able to put my lens cap on it. Also something not too pricey. I was thinking the Tiffens, unless someone else has something that would fit the bill. My question is: will the Tiffen lenses screw on to my AIS lenses? Could I use the cap for the lens on the filter? If anyone knows the answer or where I could find an answer I would appreciate it!