[Pkg-phototools-devel] Bug#778916: Root cause found (camera settings)

[Marko Mäkelä]

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