I have been selling UV filters until one of the head guys at Formatt told me not to because it is still "filtering". He said that in the case with the HD cameras, you don't want your lens protector to have ANY effect on your light. So he recommended the Optical Flat. It's cheaper too. If you search around a bit, Barry Green and some others talked about some comparisons between no lens protector and a Tiffen UV filter and the results were pretty interesting.