60D using onboard flash to trigger a 430EX II. Can you avoid the on camera flash?

Started Dec 30, 2012 | Questions thread
Mark B. Forum Pro • Posts: 22,659
Re: Stop making so hard

apersson850 wrote:

On the other hand, set the camera to ISO 6400, the aperture to f/1.4 and take a shot of a white wall one meter away.

You'll find that the sync flash is all it takes to light up the subject, even when the controller flash is set not to contribute. But you have to go to such extremes, or have something reflective in the picture, to see it. A mirror, window or somebody's eye is enough to see the sync flash.

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I don't know anyone that shoots white walls at high ISO, wide-open aperture and with external flash.  Well, I guess I know one now

I mentioned in an earlier post that it will take shooting a macro or close distances with a reflective surface for the built-in flash to show up in the exposure, but as you said these are extreme circumstances.  Under normal shooting it's not an issue.

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