Author Topic: Camera and lens calibration  (Read 3448 times)

bobfriedman

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Re: Camera and lens calibration
« Reply #15 on: October 29, 2015, 10:52:11 »
Bob,

maybe, I came across overly dramatic by saying rapid succession.  My idea of your procedure is that the camera is mounted with proper aim at the target.  I do not assume any sort of haste. I guess it takes 2 - 3 seconds to go through these steps: a) manually defocus ( I would want to make sure that the AF does not just stay where it was - If I  do not do this, I do not hear/see it budge)  b) AF focus c) expose .

yes.. each of the 3-5 shots at each AF increment need to be refocused or the LensAlign S/W will not use them..  it is not necessary to defocus but it is necessary for the camera to recored that the shot was focused.  clearly i use the AF-on actuator on the back of the camera...  if i could in some way make sure there was no variation shot to shot then i could shoot once... unfortunately i can't find an arrangement that will provide that kind of stability.
Robert L Friedman, Massachusetts, USA
www.pbase.com/bobfriedman

Bernard Delley

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Re: Camera and lens calibration: DOT tune
« Reply #16 on: December 11, 2015, 14:26:54 »
this method eliminates moving mechanical parts in the course of the calibration procedure:
http://www.dpreview.com/forums/post/50883023