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Hello i own a Canon EOS 40D and i am about to buy a
Canon EF 16-35mm f/2.8 L II USM Lens. i read that the
B+W 82mm MRC Slim UV Filter is the best choice for being used in a full frame and that the
B+W 82mm MRC UV Filter is best for cameras with smaller censors,What i want to ask is if the use of
B+W 82mm MRC Slim UV Filter will not have negative effects if it will be used in a Canon 40D that has a smaller sensor too ?
thank you
Both filters will achieve the same optical effect, so there's no photographic difference between them (as far as I know).
The slim filter has no stacking threads, so if you put the slim filter on your lens, you can't stack a second filter on the UV filter. Your stock Canon lens cap won't work either, as the cap needs threads to grip.
From what I understand is the non-slim will cause some vignetting on full frame. 40D it will be fine but if you ever upgrade to FF you will want to get the slim.
That is right. The slim 82mm filter is the best optically out there. However, as said, you will have to use the rubber slip-on cap that comes with the filter. It's a pain to use when you try to stick it onto the lens every time. Plus, the slim filter costs quite more money than what I think is reasonable.
The non-slim filter will give just a little bit vignette on full frame, on 40D it does not exist. On full frame it exist on lab test photos but in reality I don't notice it at all. You can see Bryan's comparisons made with the lens with and without filter to have an idea. But again, that only applies to strict lab testing, in the real world it's a different story most of the time - not that vignette goes away, but not likely it makes any difference.
Some also say adding a filter to a super wide angle lens will make the full frame corners less sharp, because the light coming from an angle to the lens will be bended by the filter before entering the lens elements. I do see full frame corners on my 16-35L II not sharp enough, but I don't think that's mainly due to the additional filter.
In the end, just for your information, I use a Hoya 82mm S-MRC normal thickness filter on my 16-35L and I feel fine.
You could also take the B&W's new "XS PRO DIGITAL" mount. It is even slimmer than the "slim" version (especially designed for lenses wider than 24-28mm) plus it has a front thread. The normal canon lens cap will fit.
Just don't confuse them with their "DIGITAL PRO" filters, they are for pocket cameras and have a chromium finish. (probably even don't exist for 82mm). You will want the "XS" label.
The XS PRO DIGITAL originally came in one flavour only, "007 clear glass" without UV filter, but this is not needed on digital sensors, as far as I know. Perhaps they have the "010 UV" also in this mount by now.