1D Classic AF Points

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Wakephoto
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p.1 #1 · 1D Classic AF Points

With a 400 5.6L are any of the AF points "cross-type" sensors? I have read the manual, and it seems ambiguous about this matter. With a 1.4 extender, only the center point AF is active, and it is not "cross-type." Please advise.

Jul 08, 2009 at 09:29 PM

dancam
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p.1 #2 · 1D Classic AF Points

1D series cameras can AF to f/8 with the center point. This is why the 400 5.6L/1.4x combo only works at the center. Other Canon's AF to f/5.6 at the center.

Jul 08, 2009 at 10:19 PM

pingflood
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p.1 #3 · 1D Classic AF Points

He was wondering whether the AF points remain cross type at 5.6. As far as I know they only are with f/2.8 or faster glass. That said, my 1Ds II is blisteringly fast with the 400/5.6 without a teleconverter.

Jul 08, 2009 at 11:58 PM

Ian.Dobinson
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p.1 #4 · 1D Classic AF Points

From the review of the 1D in dpreview

"All AF points are sensitive to horizontal detail, however for a lens with a maximum aperture of F2.8 or faster lens a vertical row of 7 points (as indicated in red in the diagram above, right) become sensitive to both horizontal and vertical detail, and the manual notes, are three times more sensitive than the normal horizontal sensors. Some other L lenses with maximum apertures of F4 or brighter make use of the center cross-type AF point."

Jul 09, 2009 at 01:50 AM

lexvo
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p.1 #5 · 1D Classic AF Points

To sum it up:
at f/2.8 (or faster): 7 cross AF points
at f/4: center AF point is still cross type
at higher that f/4: no cross-type AF points

Jul 09, 2009 at 05:44 PM


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