Round color filters with slim profile for wide angle lenses

[wolan]

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Hi

do you know any brand of round color filters for BW photography, which are slim enough not to have an impact when used on wide angle lenses?

I am using Tiffen color filters, but they are rather thick.

 

Thanks.

[Ken Abrahams]

I have B&W filters for M lenses sets for both 39 and 46 sizes. Widest is 21mm and no worrisome vignetting, although I wouldn't double stack.  

[davidmknoble]

More expensive, but heliopan are also slim filters.  Both B+W and heliopan are brass and should not stick to aluminum threads if overtightened.