mozzberry

I purchased mine about 9 months ago to use on a 5D2 and it required no adjustments. First thing I did when it was out of the box was perform some quick (nothing overly scientific or strenuous)...

I found the following page very useful when I had to pick one a few months ago. You can see individual reviews of all the filters listed, but the summary will probably be all you need to look...

I was in the same position about 2 months ago. I wanted an upgrade from my 50mm f/1.8 because I realised that it was my most used lens on my 5Dii, and it didn't seem right to use that camera almost...