Canon ST-E3-RT Speedlite Transmitter (Ver. 2) featured 2MP CMOS sensor pairs with

2MP CMOS sensor pairs with updated processing for more improved AF

All three lenses share the same front diameter

This lens provides a zoom range that excels in situations where you can't get closer to your subject without compromising your shot

or with EF Extender types I and II

tilted up or down

Canon ST-E3-RT Speedlite Transmitter (Ver. 2) featured 2MP CMOS sensor pairs withBuilding on the design and popularity of its predecessor, the second version of the Canon Speedlite Transmitter ST E3 RT can help you take full advantage of all the features on flashes such as the Speedlite EL 1, 600EX RT, and 430EX III RT. Version two of the ST E3 RT makes complex lighting setups simple by facilitating radio controlled, two way wireless transmission at distances up to 98. 4' among up to five groups or 15 individual Speedlites.