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Loswr
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Another vote for B+W. Except...you mention grad ND, and for that I'd skip round filters - that forces you to have the horizon in the middle, and compositionally that's rarely where you want it. Schneider Optics (parent company of B+W) makes excellent rectangular glass grad NDs in their MPTV (motion picture / tv) line, or look at Lee resin filters. You can either get a rectangular holder, or just handhold them.
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Loswr
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nairfotografia said:
They have a good reputation, and lots of people swear by them. While their filters are good, I am not a fan of their marketing strategies. For example, in their FAQs they state that their filters are not multicoated, because their testing has shown that multicoating is a disadvantage. They don't state what that disadvantage is, but the only one I can think of is that the extra steps required in production will reduce their profits.
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Otter
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nairfotografia said:
They make a high quality product. I have heard of some color casting issues and people preferring Lee over Singhray for results as well as price. They do make a nice reverse ND filter for sunsets.
Seeing as you already have B+W, if you are missing a certain ND in your collection, maybe try a different company and see if you notice a distinct difference and then make a decession. Better yet, if you know a friend who has one or there is a local camera shop that sells them, do a comparison.
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The Singh Ray reverse grad is very useful and something that Lee can't match. It is the one filter I miss after switching from Cokin P mount to Lee. I never had any colour cast problems and pricewise, when the exchange rate between pound and dollar was good, they were on a par, although they are probably now more expensive.
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I use Tiffen Digital HT UV. From my opinion, it's better than B+W XS-Pro beacause sometime XS-Pro creates yellowish image. I never use lower grad F-Pro or newer XS-Pro with nano coating.
The filter i highly regard is Hoya Super Quality Pro1. Black box with gold text.
The filter i highly regard is Hoya Super Quality Pro1. Black box with gold text.
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first, i am not sure as if i see different from filters 
and i currently own Hoya and B+W filters. According to my research, Hoya HMC UV(0) should be the choice. However, I love the solid feel of B+W filters.
Ref: http://www.lenstip.com/113.1-article-UV_filters_test_Introduction.html
and i currently own Hoya and B+W filters. According to my research, Hoya HMC UV(0) should be the choice. However, I love the solid feel of B+W filters.Ref: http://www.lenstip.com/113.1-article-UV_filters_test_Introduction.html
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Is this for use with the 16-35mm f/2.8L II? The 82mm diameter makes me suspect so, and there are a few additional considerations when using a CP on a wide angle lens. First, you may need to use a thin profile filter in the case of the CP, as a standard type may vignette at the wide end - especially if stacked with a second filter such as a UV. And secondly CPs can be problematic with ultra-wide lenses, since the polarization varies across the wide angle of view and can make skies look patchy and uneven. There was a good thread discussing this recently:
http://www.canonrumors.com/forum/index.php?topic=8112.0
I own the B&W BWKCPMCS77 slim 77 mm Kaesemann MRC CP, which I purchased a few months ago. I love B&W filters and use them on all my lenses, but I can't say I recommend this model. It is very thin and I don't get any vignetting on my 17-40mm f/4L provided I don't stack filters (when stacked with an F-Pro UV I get just a touch of vignetting at 17mm on my 5D2). But the thinness has its disadvantages. It makes the control ring difficult to adjust because there is not much to grab onto, particularly if a lens hood is fitted. It also means that a conventional lens cap does not work since there are no internal filter threads. The supplied special cap invariably falls off when I put the lens in my bag, making it essentially useless.
These complaints are repeated over and over in the B&H user reviews, but I could live with them as tradeoffs for the lack of vignetting. However, while using this filter in cold weather at Bryce Canyon NP in Utah, it frequently became jammed on my UV filter. I think this is because, unlike my other B&W filters which are brass and don't get stuck, this CP is made of steel - presumably brass is too soft to use for a thin profile filter. Finally it jammed permanently, and nothing I have tried has succeeded in freeing it. I was planning on selling it and going with a grad ND setup instead, but I can't do that until I can separate it. Very disappointing from an otherwise excellent brand...
Any advice on separating jammed filters would be much appreciated
I don't think it is cross-threaded, but filter wrenches don't work, even when used with elastic bands for better grip. 
http://www.canonrumors.com/forum/index.php?topic=8112.0
M.ST said:
I own the B&W BWKCPMCS77 slim 77 mm Kaesemann MRC CP, which I purchased a few months ago. I love B&W filters and use them on all my lenses, but I can't say I recommend this model. It is very thin and I don't get any vignetting on my 17-40mm f/4L provided I don't stack filters (when stacked with an F-Pro UV I get just a touch of vignetting at 17mm on my 5D2). But the thinness has its disadvantages. It makes the control ring difficult to adjust because there is not much to grab onto, particularly if a lens hood is fitted. It also means that a conventional lens cap does not work since there are no internal filter threads. The supplied special cap invariably falls off when I put the lens in my bag, making it essentially useless.
These complaints are repeated over and over in the B&H user reviews, but I could live with them as tradeoffs for the lack of vignetting. However, while using this filter in cold weather at Bryce Canyon NP in Utah, it frequently became jammed on my UV filter. I think this is because, unlike my other B&W filters which are brass and don't get stuck, this CP is made of steel - presumably brass is too soft to use for a thin profile filter. Finally it jammed permanently, and nothing I have tried has succeeded in freeing it. I was planning on selling it and going with a grad ND setup instead, but I can't do that until I can separate it. Very disappointing from an otherwise excellent brand...
Any advice on separating jammed filters would be much appreciated
I don't think it is cross-threaded, but filter wrenches don't work, even when used with elastic bands for better grip.
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Can't say I've ever had the problem but maybe try popping in the oven at something fairly low like 80C for a while and see how it goes? It sounds like different expansion rates in the opposite direction caused your problem.DigitalDivide said:Any advice on separating jammed filters would be much appreciated
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