7d: Pop-up flash master/slave works...check

Started Oct 1, 2009 | Discussions thread
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Julio
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7d: Pop-up flash master/slave works...check
Oct 1, 2009

Just a couple of quick 2-flash set-up shots.

Pop-up set-up to not fire and control a 550EX on the left (Group B) and a 420EX on the right (Group C.)

First shot is Group B only--notice that even though the distance was fairly short--about 4 feet--and the pop-up uses visible light to send it's commands, it doesn't contribute to the exposure.

The second one is as above but with C providing -3EV fill. When you have 3 flash groups, Group C's exposure is controled by it's own separate +/- 3 EV - 3 is equivalent to a B:C 8:1 ratio I believe.

And for trivia fans, yes that's an Ed Jovanoski bobblehead

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