Daunting is sitting down at the keyboard to attempt to do justice to a review of Canon's flagship flash, the Speedlite 600EX-RT. Few aspects of an image are as important as the lighting – arguably being second only to the subject and perhaps the composition? Good lighting overcomes so many other issues. With one or many 600EX-RT flashes available for use, you can take control of the lighting. In doing so, this device (singularly or in multiples) has the power to completely transform the quality of your images.