Leica Summarit-M 50mm f/2.5 Q&As

Announced Aug 3, 2007 •
Prime lens | Leica M | 11644
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bs1946
By: bs1946 (Nov 20, 2020)
Posted to: Leica Talk
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I have been thinking about trying to do some IR photography with my M9, one of my Summarit-M f2.5 lenses, and an IR filter. If I use my 35mm or 50mm lens, I have to use a 39mm filter and the people at B&H recommended a B+W 39mm IR Dark Red 092 filter. If I use my 75mm or 90mm lenses, then I need a 46mm filter. Here I have a choice between a B+W 46mm IR Dark Red 092 filter.or a Hoya 46mm R72 IR filter. Any recommendations of the filters or which focal length which would be best, if that...
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