There has been a lot of talk recently about what the difference is between amateur and professional photographers.

Comments by industry big shots, such as Yahoo’s Marissa Mayer who proclaim that there “is no such thing really as professional photographers” (well maybe not pro cat/flower/sunset photographers posting to Flickr anyway).

Or, when venerable institutions such as the Chicago Sun Times decide to lay off their entire photography staff – you do start to wonder – what exactly is the difference between amateur and professional photographers?

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