Can someone help me?......24-105L F4 issues

Started Nov 17, 2012 | Discussions thread
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Phil Hill
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Re: Can someone help me?......24-105L F4 issues
In reply to BRUCEK56, Nov 17, 2012

Only a flat-field lens is going to pass the newsprint-on-the-wall test.  Many (possibly most) lenses focus on a curved field, some more than others.  This is generally not an issue except for copy work.

When you focus on a wall, the edges and corners are farther away than the center and can easily fall outside the DOF.  Flat-field lenses are designed to avoid this.

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