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Author Topic: AF assist for outer focus points on 5D3?  (Read 1029 times)

skitron

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AF assist for outer focus points on 5D3?
« on: January 16, 2013, 10:21:01 PM »
Do flashes with AF assist only project a beam for center focus point use or do some models allow use of the outer points as well? If the latter, which models? Thanks in advance for any info shared!
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AF assist for outer focus points on 5D3?
« on: January 16, 2013, 10:21:01 PM »

digital paradise

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Re: AF assist for outer focus points on 5D3?
« Reply #1 on: January 16, 2013, 10:23:50 PM »
Yes they do to some degree and I know the 600EX-RT patterns are designed to work with the 5D3. 

neuroanatomist

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Re: AF assist for outer focus points on 5D3?
« Reply #2 on: January 16, 2013, 10:38:50 PM »
I previously tested the AF assist lamp coverage of the 430EX II with the 61-pt AF system of the 1D X (and 5DIII).  With a focal length of wider than 35mm, the outermost columns (which are f/5.6-sensitive lines) are outside of the coverage area.  At 35mm and longer focal lengths, the 430EX II's assist lamp covers all 61 points. 

The 600EX-RT provides full coverage, of course.
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Re: AF assist for outer focus points on 5D3?
« Reply #2 on: January 16, 2013, 10:38:50 PM »