Constrast detect microadjustment.

Started by Audionut, February 17, 2014, 08:06:58 PM

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Audionut

I have been speaking to Roger Clark (of Clarkvision) regarding permission to use his content in my upcoming article.

Roger proposed a request which I will forward here.

QuoteA big problem with phase detect
AF is 1) doing the calibration, and 2) the calibration changes
with temperature.  It should be possible to select an AF point,
focus on a target, raise the mirror, and for the same area on the sensor,
do a contrast detect AF and determine the difference and
add in the microadjustment calibration value.  More here:
http://www.clarkvision.com/articles/microadjustment/
Do you think this might be possible to do in Magic Lantern?

a1ex

This should resume to a contrast-detect AF, followed by a Dot-Tune step.

However, contrast AF fails 8 times out of 10 with my 50/1.8, so I'm not sure how this would work in practice.