100-400 wide open sharpness

Started Apr 27, 2011 | Discussions thread
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Re: 100-400 wide open sharpness
In reply to jp4, Apr 28, 2011

Typically most consumer zooms are sharper stopped down one or two stops from wide open. This is not to say that some may not yield acceptable sharpness wide open but they may well be sharper stopped down a bit. My 100-400 is best with a MA of about +3 on a 7D after calibration by Canon.

Some typical examples are shown here:


Some are wide open, some are stopped down.

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