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      01-06-2012, 01:33 PM   #2313
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Drives: '09 Cpe Silverstone FR 6MT
Join Date: Nov 2008
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2009 M3  [4.20]
Originally Posted by MATT0404 View Post
Anyone have experience with in-camera micro focus adjustments? The 5d2 is the first camera I've had that has allowed such adjustments. I'm heading out this weekend with the 100-400L so I wanted to run it through the FoCal lens calibration program. It indicated that at 100mm the adjustment should be +5, but at 400mm, the adjustment should be -11. I'm going to run it through again today just to confirm these settings.
Wow, no wonder that lens gets such mixed reviews.

Unfortunately, I think you're limited to one adjustment for each lens/extender combination. For a zoom you'll need to chose a compromise. In this case, I'd suggest adjusting for the long in, where you'll have the least DOF. Then, when you use the short end of the lens you'll need to stop down much more, or MF. Instead of doing +11 at 400, you might do +8, but remember that focus is real critical out at 400mm and wide open.