Instruct: Classify Amazon reviews into positive or negative sentiment
Query: You Get What You Pay For

On my Sony A-330 DSLR, this filter caused both focus and exposure problems. Auto exposures were consistantly underexposed. The camera appeared to have no problems auto focusing, but the resulting images were frequently blurry. By using manual exposure, and manual focus, I was able to get some nice images with this filter, but that is often inconvenient. The ring on this filter is quite thick, so vignetting is likely with wider angle lenses. A filter at this price range is not going to be multi-coated, so in-lens reflections can occur when shooting towards the sun.I later purchased the Hoya 55mm DMC PRO1 Digital Circular Polarizer. This costs much more, but has been yielding excellent results, without any of the problems I had with the Sunpak.