Autofocus Assist Beam Help

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Archive 2007 · Autofocus Assist Beam Help

kendra
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p.1 #1 · Autofocus Assist Beam Help

I'm hoping someone can shed some light on this peculiar situation.

I shoot with a 30D, 550's, I have the autofocus assist beam set to only fire when I have the flash on the camera, that way it was just the infrared beams, instead of the annoying white flash. Recently it stopped working, and even though the custom function is still turned on, the assist doesn't fire in low light.

I was wondering if anyone know of something that I may have inadvertently changed, or if it's a service issue.

Thanks so much for your help.

Dec 12, 2007 at 06:35 PM

nathanlake
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p.1 #2 · Autofocus Assist Beam Help

If there is a setting for this in both the camera and the flash (I don't have either of them), the flash usually overrides the camera. That might somehow be involved.

Dec 12, 2007 at 06:39 PM

Doug Pardee
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p.1 #3 · Autofocus Assist Beam Help

Did you happen to switch to AI Servo AF?

Dec 12, 2007 at 06:57 PM

kendra
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p.1 #4 · Autofocus Assist Beam Help

Doug Pardee wrote:
Did you happen to switch to AI Servo AF?

does AI Servo not work with autofocus assist?

Dec 12, 2007 at 07:42 PM

nathanlake
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p.1 #5 · Autofocus Assist Beam Help

Doug has it....

AF assist does not work with AI Servo is the better way to say it.

AI servo sets the focus at the moment of shutter release (or just a fraction before). There is no time to do the assist beam. To get the best use of the assist beam, use One-shot, start AF which triggers the assist beam, wait just a fraction of a second and then trip the shutter.

Dec 12, 2007 at 09:03 PM

kendra
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p.1 #6 · Autofocus Assist Beam Help

Thanks! That must be it, I'm glad it wasn't something more serious!

Dec 12, 2007 at 09:49 PM


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