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? 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? > gphoto itself will do an autofocus operation when capturing > an image in some cases. There has been a bug with this previously > because it would override the manual focus a person did. I'm not > entirely sure on the state of this now, since it is different per > camera vendor. > >> In all my tests, when in preview mode, I never saw the camera focus by >> itself on anything, if not for me to do some manual focus with the >> shortcuts. > > Try the 'a' key to autofocus if you want that. > >> 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? Jehan > Regards, > 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
