For Sale is Canon ST-E2 Speed Light Transmitter for Canon’s IR Speedlite flash models 420EX, 430EX, 430EXII, 550EX, 580EX, and 580EX II.  I’ve even used this transmitter with Canon 270EX II & 600EX-RT flashes.  It works flawless and is in excellent condition.  The battery compartment is clean; I never kept batteries in the battery compartment when not in use, so there was never type any battery leakage.  Also included is a copy of the English owner’s manual printed full-sized for easy reading; and two lithium 2CR% batteries (one was never used and the other just a few times).

 These are becoming rare, and hard to find since Canon switched their wireless flashes from IR to radio. So, if you want more natural-looking lighting and have a previous generation Speedlite this is the easiest and cheapest option (you could always spend $549 on a bulky 600EX-RT).

 Off-camera flashes capture a photography subject in more natural-looking illumination than a flash mounted directly to a camera. To operate your off-camera flash, you can set it as a slave to be controlled by an on-camera master transmitter (Canon Speedlite ST-E2). The Canon Speedlite ST-E2 wireless transmitter communicates with your Canon IR flashes, so they fire in sync with your camera.