On Tue, Sep 30, 2014 at 06:05:53PM +0200, Jehan Pagès wrote: > Hi, > > On Sun, Sep 28, 2014 at 11:17 PM, Daniel P. Berrange <d...@berrange.com> > wrote: > > On Sat, Sep 27, 2014 at 04:50:48PM +0200, Jehan Pagès wrote: > >> Hi, > >> > >> So I know about the shortcuts <>,. and these are great. But what is > >> the focus mode exactly? I read in the list: "One shot", "AI focus" and > >> "AI servo" (at least for my Canon, I imagine these are > >> camera-specific). As far as I know, these are all automatic focus > >> modes. When are they ever used? > > > > Somewhat misleadingly, to use the gphoto manual focus actions > > your camera needs to be in an autofocus mode. Basically the > > manual focus steps are simply driving the autofocus motor > > by a fixed amount. > > > > The 'a' key shortcut will do a fully automatic auto-focus > > operation. > > Ok just tested the a shortcut. Well it seems to work but with a few > problems (still Canon EOS 50D): > > 1) it works only the first time after going to preview mode. If I move > the camera and the center is out of focus, it won't refocus. This is > maybe normal, and actually I would find the opposite annoying. But > just stating to be sure of the expected behaviour. > > But especially after this first autofocus, even when clicking again > 'a' it won't autofocus again. The only way to force a new autofocus is > to get out of preview mode, then back in, then 'a' again. > I imagine this one is not expected behaviour, is it?
I have an idea of what the bug might be there, so I'll look into it. > 2) I can clearly hear the shutter closing/opening while autofocusing. > Is it normal or even needed? Can't the autofocus happen during preview > mode? That is strange - at least with my Nikon that does not happen. Unfortunately my Canon 450D doesn't support autofocus at all Perhaps try it in the gphoto2 shell eg # gphoto2 --auto-detect --shell > capture-preview > set-config /main/actions/autofocusdrive=1 > set-config /main/actions/manualfocusdrive=6 > set-config /main/actions/manualfocusdrive=0 > set-config /main/actions/autofocusdrive=1 and see if the same behaviour occurs. > >> Also there is this option "Display focus point during preview". All it > >> does is adding some red "target" icon in the middle of the preview. > >> But is this used in anyway? As I said before, I don't think I ever saw > >> Entangle auto-focusing my image, so I thought that maybe the color of > >> the target would change at some point to tell me this center point is > >> focuses, or something. But not even. It is just always desperatly red. > >> What is the point of this focus point? Has it a purpose other than > >> displaying a target? > > > > Since gphoto does not let us choose the autofocus point the camera > > uses, the only point of the focus point rendering is as a center > > point for positioning your shot. > > This is a very annoying limitation, in my opinion. Do we know if this > is a limitation of gphoto, or is it a limitation from the available > interface given by camera makers? I'm not sure where the limitation comes. Conceivably it could be from either place. I don't suppose you know if Canon's own capture software allows the focus point to be chosen ? If Canon's software can do it, then the limitation would be gphoto2, but if canon's software cannot do it, then the limitation is the camera. Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :| _______________________________________________ Entangle-devel mailing list Entangle-devel@gna.org https://mail.gna.org/listinfo/entangle-devel
