Dear Cet Senol:
Thank you for your reply. After researching this software on the
internet it appears that CHDK doesn't make any actual changes to your
camera. If you delete the CHDK software from your memory card, or if
you choose not to activate the CHDK software on the card (or remove and
replace the batteries), then the camera will behave absolutely normally
- nothing has been (or ever is) changed, so the warranty is not
We hope this information is helpful to you. Please let us know if we
can be of any further assistance with your A720 IS camera.
Thank you for choosing Canon.
Technical Support Representative