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[OM] camera lens filters

Subject: [OM] camera lens filters
From: John Hudson <OM4T@xxxxxxxxxxx>
Date: Fri, 28 Aug 2015 09:58:13 -0300
Volume 24 of the Canadian "Photo News" magazine carries an article part of which reads:

"One more number should be found on your lens. It is usually preceded or followed by the symbol Ø. It is the size of the filter needed for that lens. So, on a 50mm lens the filter size will /*never*/ [sic] be 50mm , as this filter size doesn't exist. Most likely, you will find a Ø52 or a Ø49."

Question: why no 50mm filter size?

I have done an extensive google search and have not found an answer.

jh



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