I think it emanates from the photo mags and books. They always put (f5.6 1/125) next to all the photos they printed. As if it mattered one way or another. I wondered for a bit if I was missing something important in these numbers, but soon realized it was just what we would nowadays call a thing with geeks and numbers.
Its perpetuated in the photo cataloging programs which make a great play on being able to index on shutter speed or f-stop. I really want to collect together all the photos I ever took at F11 - NOT. You can get programs that will go through your hard disk and report back on your average shutter speed (yawn zzzzz). What you can't get is program that will show you all the Dragonfly photos you took in Northamptonshire. Well they will but the method they use to allow you to tag them in multiple ways is awful.
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