Citation
* Save images in RAW format
* Ability to run "Scripts" to automate the camera
* Live histogram (RGB, blended, luminance and for each RGB channel)
* Zebra mode (blinking highlights and shadows to show over/under exposed areas)
* An "always on" full range Battery indicator
* Ability to turn off automatic dark-frame subtraction
* a higher compression movie mode, and double the maximum video file size
* exposure times as long as 65 seconds
* exposure times as little as 1/10,000 of a second
* ability to use the USB port for a remote trigger input
Additional features:
* a depth-of-field (DOF)-calculator
* File browser
* Text reader
* Calendar
* Some fun tools and games
Citation
* A450, Fw: 1.00d
* A460, Fw: 1.00d
* A550, Fw: 1.00c
* A560, Fw: 1.00a
* A570, Fw: 1.00e, 1.01a
* A610, Fw: 1.00e, 1.00f, (1.00d with CHDK version for 1.00e)
* A620, Fw: 1.00f ( 1.00e is not compatible. You must upgrade to 1.00f first (see here))
* A630, Fw: 1.00c
* A640, Fw: 1.00b
* A650 IS, Fw: 1.00d
* A700, Fw: 1.00b
* A710 IS, Fw: 1.00a
* A720 IS, Fw: 1.00c
* S2 IS, Fw: 1.00e, 1.00f, 1.00g, (1.00i with CHDK version for 1.00g)
* S3 IS, Fw: 1.00a
* S5 IS, Fw: 1.01a 1.01b
* G7, Fw: 1.00e, 1.00g, 1.00i, 1.00j
* SD450 (IXUS55), Fw: 1.00b, 1.00c
* SD500 (IXUS700), Fw: 1.01a, 1.01b
* SD630 (IXUS65), Fw: 1.01a
* SD700 (IXUS800), Fw: 1.00b, 1.01b, (1.01a with CHDK version for 1.01b)
* SD800 (IXUS850), Fw: 1.00e, (1.00d with CHDK version for 1.00e)
* SD850 (IXUS950), Fw: 1.00c
* SD870 (IXUS860), Fw: 1.00c
* SD1000 (IXUS70), Fw: 1.01b, 1.02a, (1.01a with CHDK version for 1.01b)