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Author Topic: EOS 7D AF- Centre point 'increased sensitivity' with fast lenses  (Read 1188 times)

insanitybeard

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EOS 7D AF- Centre point 'increased sensitivity' with fast lenses
« on: November 08, 2012, 10:20:14 AM »
With the EOS 7D, all 19 AF points are cross type, but the blurb states that:

 "for enhanced precision, the central AF point features extra sensitivity when used with lenses having a maximum aperture of f2.8 or faster" (taken from Canon's official EOS 7D brochure)

Does this mean the centre AF point is double cross type or have an additional horizontal / vertical line activated at f2.8? Or is it just a more sensitive standard cross type sensor? I can't find anything in Canon's literature or in the likes of dp review that clarifies it.

   Thanks!
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EOS 7D AF- Centre point 'increased sensitivity' with fast lenses
« on: November 08, 2012, 10:20:14 AM »

neuroanatomist

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Re: EOS 7D AF- Centre point 'increased sensitivity' with fast lenses
« Reply #1 on: November 08, 2012, 10:23:12 AM »
Does this mean the centre AF point is double cross type or have an additional horizontal / vertical line activated at f2.8? Or is it just a more sensitive standard cross type sensor? I can't find anything in Canon's literature or in the likes of dp review that clarifies it.


The center point on the 7D is a dual cross point, an f/5.6 cross in a '+' orientation with an f/2.8 cross superimposed in a 'x' orientation. 

http://www.the-digital-picture.com/Photography-Tips/Canon-EOS-DSLR-Autofocus-Explained.aspx
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insanitybeard

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Re: EOS 7D AF- Centre point 'increased sensitivity' with fast lenses
« Reply #2 on: November 08, 2012, 10:28:26 AM »
 :D Thanks Neuro! I knew you'd clear that one up!
7D / EF-S 10-22 / 17-40L / 70-200 f4L IS / EF-S 60 macro

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Re: EOS 7D AF- Centre point 'increased sensitivity' with fast lenses
« Reply #2 on: November 08, 2012, 10:28:26 AM »