My wife has bought me a Sigma 10-20 DC for Christmas but has forbidden me to touch it before then on pain of death! So to occupy myself while I'm waiting, I'm trying to decide on some decent filters for it.
I want a coated UV filter and a CP filter but understand that unless the filter is slim, then it may cause vignetting. How bad is this problem on non-slim filters?
Can anyone please recommend any filters for this that won't break the bank, slim or otherwise? Cheers in advance.

