The author of gphoto2 (Marcus Meissner) has tracked down this problem:
http://permalink.gmane.org/gmane.comp.multimedia.gphoto.devel/8285
He suggests that the "Continous AF" needs to be set to "Off" in the
camera menus. On my Canon EOS 650D it was not only that, but also "AF
method: Quick mode" will be needed. When this setting is selected, the
"Continuous AF" is grayed out in the camera menu.
With the above two camera settings, I get both the coarse and fine focus
working using darktable 1.6.6-2 and libgphoto2 2.5.7-5 and the following
lenses:
EF-S 18-135mm 1:3.5-5.6 IS STM
EF-S 60mm 1:2.8 IS USM
It works equally well with the lens in the AF or MF mode.
The only focus-related setting in the Darktable GUI seems to be "focus
mode: One Shot". I think that Darktable should either try to ensure that
these extra settings are configured to sane values (so that the manual
focus control works at all), or it should expose these settings in the
GUI.
There is a related gphoto2 issue filed upstream:
http://sourceforge.net/p/gphoto/bugs/978/
Best regards,
Marko Mäkelä
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