Dentro del mismo foro podras encontrar excelentes guias acerca del chdk.
En cualquier caso, la guia oficinal del sitio CHDK, la puedes encontrar aca
CHDK for Dummies - CHDK Wiki
Y que cambios trae?
pues esta es la lista
Main features:
- 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