So as I referenced in an earlier post, I bit the bullet and bought a camera so I could test out CHDK. CHDK is a hacked firmware for canon cameras that use one of three imge sensors. I believe it is the digic 2, 3, and 4 sensors. It turns out that all of the powershot line uses the same image sensors. The optics, buttons and features are added or removed based on the price point of the camera. If you use CHDK you can enable them AND add new features the designers may never have thought of! click here to find a compatible camera on amazon More info about my trials and tribulations after the jump.