To go along with the just-announced EOS 5D Mark III, Canon has introduced a new series of accessories that will be rolling out over the next few months. Most notable is probably Canon's new flash, the Speedlite 600EX-RT. This $629.99 flash is Canon's new top-of-the-line model and is the first Speedlite on the market with a built-in wireless radio transmitter, which eliminates the need for accessory radio units. The 600EX-RT can be used as a master unit and trigger up to 15 off-camera "slave" 600-EX-RTs, as long as they're within 30 meters of the master unit.

The flash itself is more powerful than its predecessor (the 580EX II), as well — it now covers a zoom range of 20mm to 200mm, and has a guide number of 60 meters. To go along with this flash, Canon's also introducing a new Speedlite Transmitter ST-E3-RT, a $470 accessory that can be used to manage and shoot from a Canon EOS camera and set of 600EX-RTs — you can fire a single camera remotely, fire up to 15 linked cameras at once, or fire five groups of flashes in the same 30 meter coverage area as the 600EX-RT. Both the Speetlite and the transmitter should be available by the end of March, along with the 5D Mark III.

There's also a new battery grip for the Mark III, the BG-E11. This grip takes two Canon battery packs or a set of six AA batteries; it also adds vertical shooting controls and includes a vertically oriented multifunction joystick and multi-function button. While the added weight and size of this accessory isn't for everyone, it does significantly extend battery life and also makes shooting in portrait much more comfortable. The BG-E11 will retail for $490 and should be available by the end of April.

Lastly, there's a couple of accessories that help untether your camera from cumbersome wires and keep better track of where you shoot. The Canon Wireless File Transmitter WFT-E7A features 802.11 a/b/g/n connections and also includes a port for gigabit ethernet. Most notably, there's a WFT server mode that lets any web-enabled device (including tablets or smartphones) remotely control the camera. It's compatible with the 5D Mark III, 7D, and 60D, and will cost $849.99. The GPS Receiver GP-E2 can be attached to either the 5D Mark III or the EOS-1D X via the hot shoe or USB port and logs every shot you take, including which direction you were facing when it was taken; it also records routes between shoots, letting you track every step of your shoot. The GPS receiver will retail for $390, and will be available at the end of April alongside the Wireless File Transmitter. If you have any money left over after picking up your 5D Mark III, Canon would surely like you to keep these accessories in mind.