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Sorry perhaps a Mod could close this threadI though it might be an interesting question it has just attracted the usual "I hate Nikon" posts
I am often puzzled, why friends who always use Auto or P and take perfectly composed, correctly exposed photographs at the decisive moment, with beautiful lighting; want to "understand" shutter speeds and apertures
I actually find the phrase "pure photography" really hipster, pretentious, affected, and offensive.
Huh Pure photography... it's Nikon trying to sell a crapton of cameras. - See more at: http://forum.nikonrumors.com/discussion/1754/what-is-pure-photography#Item_4
Ignore troll posts. More good answers will come.
My legitimate response was 'it's a lifestyle choice' - as in, to be pure about photography you have to live for it - either as a working professional or as that guy who gets up at 4:30 a.m. to drive to a location and shoot good light. It has nothing to do with gear.