Please help, I'm new to forum. I have a Swarovski ATS80HD scope and I want to get into digi scoping. I'm going to get a EOS Canon 550D camera and a Swarovski DCA adapter and I know that the lens i need is a fixed 50mm, but which will fit the DCA adapter, 50mm f/1.2, f/1.4 or f/1.8. I know I should get the best that I can afford and these lenses vary greatly in price but I don't know if all these lenses will fit the thread on the adapter. Please help someone.