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Archive 2012 · 1D3 Auto Focus @ f/5.6 Question
  
 
dwweiche
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p.1 #1 · 1D3 Auto Focus @ f/5.6 Question


My new (to me) 1D3 has pretty much been used exclusively with a 70-200L f/2.8 IS II since I have been able to get close enough to the action to not need anything longer.

However, I am anticipating needing to use my 100-400L in the future.

The manual clearly states that at f/5.6 all 45 AF points will be horizontal-line sensitive only, thus when I am at or near 400mm, I will have no cross AF sensors. With my 7D, all of its 19 points remain cross-type at f/5.6.

My question to 1D3 users, what is your experience with AF speed and accuracy in both one-shot and servo when shooting a lens with a maximum aperture of f/5.6? Perhaps you birders who fancy the 400 f/5.6 prime can chime in? Will I notice focussing issues that I have not experienced previously because I've been living at f/2.8? FYI, when I shoot in servo I almost always have the 6 surrounding assist points active.

Thanks much!



Aug 14, 2012 at 03:34 AM
Photon
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p.1 #2 · 1D3 Auto Focus @ f/5.6 Question


I shot a lot of soccer with a 1D3 and 100-400 L, and the AF accuracy was good. The speed of acquisition was quite a bit slower than with 70-200/2.8 or 300/2.8, but follow focus was no problem. Static shots were dead on.


Aug 14, 2012 at 04:44 AM
Lars Johnsson
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p.1 #3 · 1D3 Auto Focus @ f/5.6 Question


I have been shooting with the 400/5,6 and 800/5,6 lenses for years. Speed and accuracy is good


Aug 14, 2012 at 05:08 AM
Pixel Perfect
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p.1 #4 · 1D3 Auto Focus @ f/5.6 Question


Ditto, I have always found my 1 series cameras to work well with f/5.6 lenses.


Aug 14, 2012 at 05:55 AM
dwweiche
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p.1 #5 · 1D3 Auto Focus @ f/5.6 Question


Thanks for the feedback.


Aug 14, 2012 at 12:11 PM





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