At the lightning speed of 1 / 250 second, the EOS 60D also a popular E-TTL II flash control system. Each of the EX-series Speedlite flash units (sold separately), E-TTL II provides reliable light or fill-in flash pictures in the sun or a flash in the darkness. E-TTL II, a precise measurement of the 35-zone sensor is used to measure the ambient light is also used to measure the flash – and you even more control over the measurement image. If you fill a larger area in a flash should be amended in the configuration menu for the measurement of “”media”" – which means flashing an area of 35 evenly. In addition, the EOS 60D is an integrated control system Speedlite Transmitter for comfort, wireless access in all units of the Speedlite EX series defines a slave.