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Question: Why Aren't MOST lenses sharp wide open!? !?
Always wondered why most lenses are a little soft wide-open!.Www@QuestionHome@Com


Best Answer - Chosen by Asker:
The bigger the aperture gets, the harder it becomes to correct all the optical aberrations!. Consider that the further out on the lens the light strikes, the more it has to be bent!. This more severe bending amplifies any deviation from perfection!.Www@QuestionHome@Com

Optics!.
When it is wide open it is letting in the max available light!. The depth of field (whats in focus) is a smaller distance which can result in a softer image!.Www@QuestionHome@Com