Before the rush

Before the rush
by evan-pak

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Is the the screw thread of a filter regulated by some standard? I am talking about round filter. For example, is the ISO metric screw thread standard applicable?

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up vote 6 down vote accepted

I don't know the real answer, but in lieu of someone who does, a quick search tells me that apparently not, but that a 0.75mm thread pitch is used by "most Japanese photographic manufacturers today".

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