Leitz Summitar filters are really getting pricey but here is a solution to all you B+W shooters...a Nice Summitar fitting Walz filter in red(approx Wratten #25). Glass is real OPTICAL glass not cheap acrylic.

A short note to international bidders....I pay for shipping to the USA Ebay hub ONLY, I don't pay shipping to your country nor do I pay customs/duty and any local taxes that may be levied on your purchases from me.