I have a Schneider Xenar 15cm f/3.5 dated to 1929. I would like to use filters on it and as far as I have been able to determine the filter thread is likely 40.5mm with a 0.5mm pitch. Can anyone confirm this or provide the actual specifications?

Also, if the pitch is indeed 0.5mm does anyone know a current brand that makes these (as opposed to the common 0.75mm pitch thread)?

Thanks in advance.


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