Tag Archives: speedlight

Canon 600EX-RT, Disable Flash Firing but Use As Master

Canon’s ST-E3-RT was a disappointment for low-light and event photographers because, unlike it’s predecessor, it lacks the AF assist beam.  If you need the AF assist, you’re forced to use a full fledged 600EX-RT, but what if you don’t actually want the master unit to produce any light?  Simple.  Pop the flash onto your 5d mk III, and use the following steps (also works on a 1D-X.)

Select “External Speedlight control” on the first page of the red menu.

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