Perhaps Dan will oblige. Or Oren. Or someone German, they can pretend to sound authoritative even if they aren't... what is the best way, in English, to "formally" describe a len's aperture and focal length?
For years I've been doing what most people do and writing "90/8" or "210/5.6". If I feel fancy I might use "210mm f/5.6". And I know that gets the information across. But please indulge me here. Should there be a slash before the aperture as though it is a fraction? Is "f/aperture" correct?
Also is it "len's aperture" or "lens's aperture" for a single lens?
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