I just picked up a Canonet QL17 III on ebay and I also went to BandH and picked up a UV filter. I didn't realize it when I bought it, but the metal part around the glass covers just a little bit of the built in light meter and throws off the exposure around 1 stop. I could just up my film speed, but I'm wondering if anyone has one of these cameras and knows the correct filter. The one I bought is a B+W brand. The metal ring does look maybe slightly bigger than most filters. I could try ordering some other ones but BandH only has that brand in stock. Anybody have one of these with a working filter? Would love to know what you use. Thanks!