With manual radio triggers you must figure a new power output for each slave flash every time your subject moves. As soon as your subject or scene changes, you’ve got to physically touch each of your lights again, as well as thinking your way through a new exposure calculation.

One of the coolest and most under valued features of the eTTL / iTTL flash system built right into your existing camera is the ability to allow your camera to automatically calculate the required output power of your slave flashes on the fly - shot to shot.

This frees you to shoot - to get creative with your subject - to interact. You’ll no longer ruin the “mood” with your subject to continually fiddle with your lights.



Remember also that you’re not stuck with this “auto” exposure - you can always dial the automatic exposure up or down a bit to taste using the Flash Exposure Compensation (FEC) control on your camera so you never loose the “fine tuning” control of your flash output.

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