Filter size for Schneider Xenar 150 4.5

[snommisbor]

I have search for this and can’t find the answer for sure. Just wanted to confirm if it is a 34mm. Trying to get a step up ring or rings to a 52mm. I included a photo so it could help. Thanks

[BrianShaw]

A ruler doesn’t answer the question????

Maybe this will help:

https://www.schneideroptics.com/info/vintage_lens_data/large_format_lenses/xenar/data/4,5-150mm.html