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Old December 26th, 2007, 01:57 PM
Bart_van_der_Wolf Bart_van_der_Wolf is offline
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Join Date: Jun 2006
Location: Netherlands
Posts: 4,054

Originally Posted by Nicolas Claris View Post
ABSOLUTELY brilliant Bart!

I sure will give it a try tomorrow…
For zoom lens like the Canon 24-70 what lenght would yoy choose for calibrating? 50 mm?
Canon suggests to use the longest focal length of the zoom range, 70mm in your example. Of course you can check afterwards how well that works for the shorter ones, but in my experience they are harder to calibrate because the DOF is already a lot more. The DOF of the shorter focal lengths will probably exceed the adjustment range anyway.

Afterall, what the AF micro adjustment does is add an offset to the lens calibration data to change the average focus position within the DOF limits of the widest aperture. That is done more easily at longer focal lengths.

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