I'm seeing these well reviewed on Amazon, and the proper size CP for my 14mm (which will be here Monday, Woot.) is about $40. The filter looks very slim, so vignetting shouldn't be bad. Amazon says they're not multi-coated, but the EX DC series lenses and filters do have multi-coating of a sort, to eliminate ghosting and such, so I don't know whether these actually have the same sort of multi-coating as a good Hoya or B+W. But, like I said, the reviews are very positive. I might spend some Amazon credit and try one out.