Summary: I reseached a lot before buying this and am very pleased with my choice. It's thin, no vignetting, and does not affect the photographs in any way I can see. Why spend a lot on a lens and then put a rubbish filter on the front!!! Buy this one.
Summary: What can be said about a filter - not a lot unless it degrades the image or is of poor build quality. Well with this filter it is well made and does not degrade the image when on the front of a lens. I would recommend this filter.