Hi, i recently got a Canon S3 SI and wanted to get some filters (UV and polarizer) and dont know what brand to get, what size 52mm or 58 mm or where to purchase them for a good price. Im in Montreal Canada.
if you have the canon adaptor, then the size you want is 58mm
if you buy one from lensmate online, you can get either 52mm or 58mm
i have the canon 58mm one and have bought a Hoya UV filter and a Hoya Circular Polarising filter
they have worked well for me
Canon Powershot S3 IS
Canon EOS 40D + Battery Grip BG-E2N | EF 24-70mm f/2.8 L USM | EF-S 10-22mm f/3.5-4.5 USM | EF 85mm f/1.8 USM | EF 100mm f/2.8 Macro USM | EF 70-200mm f/2.8 L IS USM II | 580EX II | Flickr - blentley CSC
A low quality UV sensor will be noticeable. For anything but professional grade use I don't think you'll notice a difference with a high quality UV filter, and it does help protect the lens. The same is true for your video camera. A clean, high quality UV filter won't be noticeable.