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Ernie Aubert wrote:
Well, not to be pedantic, but I'm guessing you're really asking what was amiss, not why was it amiss. The whole frame was blurry; turning the focus ring had a visible effect in the center circle, but it never became clear; it was totally unusable. Quite a disappointment.
A few suggestions:
Are you sure it is orientated correctly ? (it should be the polished/shiny side downwards) Since the 5DIII doesn't have (at least officially) replaceable focus screens, it appears Canon have removed the 'handling tab' which usually gave a clue about up and down.
Also if it isn't seated correctly, you would see, what you describe.