On Mon, Sep 06, 2010 at 14:24:55 +0200, Florian Echtler wrote: > I'm currently considering a Logitech C910 for some long-term outdoor > imaging. In particular, this means that the camera will have to be able > to do very long exposure times (probably >= 1 sec) for nighttime shots. > > Can somebody tell me if a) this camera can do this at all and b) if so, > does the uvc driver currently support this?
The UVC driver does not support still images, but if you select a frame rate low enough, exposure time will be larger. Unfortunately, it seems that few cameras allow frame rates _below_ 5 FPS. Logitech only lists the _max_ frame rate in their specs, but their happens to be discussion on the C910 in their forums with a dump from guvcview (this is the kind of info we'd love from every cam!): http://forums.quickcamteam.net/showthread.php?tid=1345&pid=4976#pid4976 See, nothing below 5 FPS. For your kind of application, I would almost recommend getting a cheap and/or used digital camera and controlling it with gphoto2. (My guess is you will also get more and perhaps better megapixels for the same price, unless you need an additional mini-tripod.) I'm saying "almost" because: a) I have never owned a camera where this gphoto2 mode was supported. I haven't tried my wife's old IXUS 70 yet though, it should work. Let me mark that as something to try on a rainy weekend. b) I don't know how to set exposure and focus, let alone zoom. According to http://www.linux.com/news/software/applications/47498-sophisticated-picture-taking-with-gphoto "Focus, aperture, and other settings will need to be set before taking any shots." Fair enough. I guess you could always use auto-exposure. I hope this helps, at least to find a path to a different solution. Moritz _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
