Hello. I have these 2  adaptors to use on my 2 inches focuser. (I don't know how to call them). To use a 1.25 piece, I use the 1.25 to 2 inches adaptor, for my 2 inches EP, I use the 2 inches adaptor. The 2 inches adaptor has threads inside to screw something. (I guess to screw a 2 inches filter on?) 47.8 mm My 2 inches eyepieces has threads at 46.1 mm ================== My goal would be to buy a 2 inches UHC filter and put it on the 1.25 to 2 inches adaptor (a