Author Topic: Constrast detect microadjustment.  (Read 1530 times)


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Constrast detect microadjustment.
« on: February 17, 2014, 08:06:58 PM »
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.

A 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:
Do you think this might be possible to do in Magic Lantern?


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Re: Constrast detect microadjustment.
« Reply #1 on: February 17, 2014, 08:12:13 PM »
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.