The PowerShot G10 is compatible with the Speedlite EX series that is for all EOS series SLR cameras. Attach a Speedlite 580EX II to the hot shoe, then you can set and control the flash on the "Flash Control" menu in the camera. With the 580EX II, the G10 is given extra functions such as autoflash metering, FE lock and Flash exposure compensation; continuous shooting with external flash. Also Canon's Speedlite Transmitter ST-E2 enables you to have multiple slave flashes and wireless control. A Tele Coverter lens designed for the G10 and High-Power Flash designed for all PowerShot cameras are also available.