Thanks to AndroidAndMe for highlighting this one. it writes:
If you haven’t figured it out by its clever name, DSLR Controller is an app that lets you control your DSLR camera (more specifically, your Canon EOS DSLR camera). You can link up your camera and your Android device via USB (we used a Toshiba Thrive for easy testing) for things like a live view from the lens, focus controls, aperture settings, etc right on your device screen.
The app’s developer writes:
DSLR Controller is the first and only app that will allow you to control your Canon EOS DSLR from a compatible Android device over USB. You need a Honeycomb tablet or an SGS2 (with KG1 or newer firmware) and a USB host (OTG, On-The-Go) cable / adapter for this.
Previous Android Applications in Focus: