 Features include shooting in RAW, USB-cable remote shutter-release, synchronized shooting between multiple cameras, motion-detection triggered photography, customizable high-speed continuous (burst) TV, Av, ISO, and Focus bracketing (increasing depth of field), 1 Gig video-size limit removed in earlier cameras, Shutter, Aperture, and ISO overrides (shutter speeds of 64" to 1/10,000" and higher).For the CHDK project to augment or extend firmware, it was necessary to obtain copies of the cameras' original firmware; in some cases this can be done via a pure software method, while others rely on a method of using a blinking LED on the camera as an optical serial port to transmit the firmware to a host computer.However, to install precompiled firmware on a PowerShot camera, it is only necessary to download the correct binary and copy it to an SD memory card.