D7000 pics from this past autumn
Larold, I do not have a CPF for this lens. It's the Tokina 12-24 and from what I've read CPFs cause vignetting on wide lenses. I do however, have one for my 18-70. I like it very much. Perhaps some Conkin or Lee system with a ND filter would help for the 12-24. I've been toying with the idea of getting one anyway.
Funnily enough, it looks like the processing here somewhat fiddled with the colours from the photos. The ones I uploaded to Smugmug appear to be a bit closer to the converted from raw ones.