I've been using the B&W Kr1.5 skylight F pro series filters. These are basically the same as the hoya Skylight filtering. The only lens I've not bothered putting the filters on is the 15-30mm wide as it has a weird hood/thread arrangement, but like Hoya, B&W did a range of thin rimmed filters for wide angle lenses, which is a good idea.
I'm not so sure about who's selling them currently, as I've not bought any recently. The importers have changed a couple of times, but I think B&W are probably still under the same group as Schneider & Hasselblad. Maybe retailers like Calumet, Warehouse express and jessops might be worth a look.
Maybe Amazon might also be worth a look?
hope this helps?
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primarily using Nikon film and digi kit, and some micro 4/3rds gear for experimenting with old lenses
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