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Author Message   Finnegan Tinkerer Username: Finnegan Post Number: 51 Registered: 09-2009 Rating: N/A Votes: 0 Posted on Tuesday, August 31, 2010 - 05:25 pm:    Sure, that is how apertures were listed back then. I'm surprised you didn't mention f18 also. Later on f stops were re-standardized to the way it is now.