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Anonymous
>the DoF is infinite when focusing to 1m or farther.
Not true. There's much more depth of field, but the far backgrounds are still obviously out of focus, and bokeh matters for more than just the extremely blurred parts. Someone standing a meter behind your focused subject three meters away is going to be drawn differently depending than if he was where the focus hits.
Different lenses draw the picture differently, both in the in-focus and out-of-focus areas. That matters, no matter how much noise there is owing to sensor size. (And these things are usually clean up to 200, too.)
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