I'm thinking about getting the filter for my Tamron 17-50mm (67mm). From what I can gather from production description and the review of the B+W filters right here on this site, it's better to get a better quality filter so not to degrade the image quality achieved by the lens...


By "degrade" what kind of distortions are they talking about? The most mentioned seemed to be flare control with multiple lens coatings. Are there others involved? CA, Contrast, Sharpness? I'm trying to see if the added cost of having better build quality, multiple lens coating vs not so rugged build and no coating is worth it?Will the "degradations" even be noticeable? I think I can live without the ruggedness and good sealing because the only "weather-sealed" gear I own is the 7D and maybe the LowePro bag [:P]