I have a Canon EOS 20D and exclusively run Linux. I want to begin doing macro photography with my 20D in a variety of setups, and what would be really nice would be able to connect a USB cable to the camera and control the camera from the computer, and in addition get a quick look at the images I take on a large screen. This is my goal, let's see how easy it is to get there.

I am running Fedora Core 8 (circa February, 2008), and find that I have both Gphoto2 as well as libgphoto2on my machine. There is a package called gtkam (which is actually a project on the gphoto page). This is not available as a yum package and does not seem to be on my system, they suggest it as a reference implementation for a graphical libgphoto2 client, which hints that it is not intended to be a real working graphical application.

Here are some links to reference information:

• The Gphoto2 manual
• Remote Controlling Cameras
• Open source PTP project
• Local libusb documentation
• Linux digital camera support
• Canon powershot protocol description
• S10sh is a command line thing that manipulates Canon PowerShot Cameras (and who knows what else). Newer versions are available.
• Local copies of the s10sh scripts.

• Testing Gphoto2 version 2.4.0
• Building Gphoto2 from 2.4.3 svn branch
• Testing Gphoto2 version 2.4.3(99) in 1-2009
• Testing Gphoto2 version 2.4.3(99) in 2-2009
• Building Gphoto2 from 2.4.4 distribution
• Testing Gphoto2 version 2.4.4 2-10-2009
• Hackers guide to gphoto2 and libgphoto2

The following link had a nice discussion of all this, and I ran across this via a google search on Canon 20D gphoto2 capture. Canon 20D gphoto This guy was active in December of 2007, so this may be good current information.