Hi, On Tue, Sep 30, 2014 at 8:49 PM, Daniel P. Berrange <d...@berrange.com> wrote: > 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.
I'll try later. I don't have access to my camera right now. >> >> 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. Well I suppose there is no Linux version of the Canon software. So no, I never tried. I could try and install the official software in my Windows VM though. I hope it is downloadable on their website. Jehan > 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
