I went FF a few months ago, and I keep running into all the small things that have changed (mostly for the positive). Nonetheless, now my trusty B+W F-Pro c-pol is vignetting on my 24-105mm at 24mm even if the lens is stopped down.
I saw some old postings on going for the XS-Pro mount instead. For those experienced using B+W c-pols, would the B+W XS-Pro Kaesemann Circular Polarizer with Multi-Resistant Nano Coating work the best? Is there a slim version of this filter that I should get instead (I don't usually stack filters)?
Thanks for the help, as I'm already a bit pissed at myself for having to buy this kind of filter twice.
Interesting. I just tried out my 7 yr old B+W F-Pro 77mm on my new 6D + 24-105 and didn't get any noticeable filter vignetting at 24mm. I saw the expected 2-3 stop vignetting at wide apertures (as on the naked lens), and very slight vignetting at 8-10 (~1 stop), but that's normal at 24mm based on lens reviews I've read. Using the lens corrections in LR eliminates corner vignetting anyway, because the distortion correction at 24mm clips the extreme corners right off, but I didn't really find that necessary for most images.
In my past experience filter vignetting is black and hard, not just 1-2 stops as I experienced. Did you check to make sure the filter was thoroughly screwed in, and that your hood was properly aligned? I wonder if this thicker filter is right on the edge in terms of vignetting, and slight variations in lenses or filter installation make the difference.
I'm sure the XS-Pro Kaesemann is a great filter, but at $160 I think I'll stick with the F-Pro and be prepared to crop a tiny bit if I ever get bit by vignetting.