Am Samstag, 19. Dezember 2015, 20:01:37 schrieb Dr. Johannes Zellner: > Hi, > > I'm still trying to have a possibility in tethering to trigger autofocus > (AF) manually but not automatically. > This is useful, if AF fails in a difficult scene -- currently, if AF > fails, capturing fails too. > > Here's my idea: > > Even if AF is turned on at the lens, gphoto2 allows to bypass AF when > capturing. > There are two possibilities how to do this: > > * > > Canon EOS cameras (and probably for others too) can be configured not to > trigger AF when pressing down the capture button. AF is still possible > but it has to be done with a different button on the backside of the > body. If the camera is configured like this, gphoto2 allows to do AF and > capturing independently from each other like this: > > gphoto2 --set-config autofocusdrive=1 --wait-event=5s > gphoto2 --capture-image-and-download > > * > > there's also a second method to bypass AF which doesn't even need the > camera to be configured not to trigger AF when pressing the capture > button: > > gphoto2 --set-config eosremoterelease=4 --set-config eosremoterelease=5 > --capture-tethered=5 > > For method 1. to be used from darktable, I tried to implement the > --set-config autofocusdrive=1 command in dt. Essentially I implemented a > button (an eye symbol right from the manual focus buttons) which > triggers > > dt_camctl_camera_set_property_int(darktable.camctl, NULL, > "autofocusdrive", 1); > > This indeed triggers AF the first time I click on the newly implemented > button and starts the camera's AF search. > Unfortunately, after having used this AF button once, the tethering > session hangs somehow and no further commands can be sent to the camera. > > > Any help on how to implement this correctly would be much appreciated.
Did you try to use the "additional properties" in the bottom of the camera settings to use those gphoto2 commands? Tobias
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