I just got my 40D and I know the new cross Type AF senors are suspose to be a big improvement. But guess I don't understand what a cross type sensor is.
Can someone explain
canonshooter Goldmember 2,242 posts Joined Aug 2005 Location: Arizona, USA More info | Sep 15, 2007 16:56 | #1 I just got my 40D and I know the new cross Type AF senors are suspose to be a big improvement. But guess I don't understand what a cross type sensor is. Jim
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Hermeto Cream of the Crop  6,674 posts Likes: 2 Joined Oct 2005 Location: Toronto, Canada More info | Sep 15, 2007 17:07 | #2  Permanent banPicture tells all..  What we see depends mainly on what we look for.
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basroil Cream of the Crop  8,015 posts Likes: 2 Joined Mar 2006 Location: STL/Clayton, MO| NJ More info | Sep 15, 2007 17:21 | #3 most sensors use a strip of contrast senors to see if something is in focus or not (high contrast=focused). a cross type sensor is when there are two perpendicular strips checking for contrast. in addition, most cross type sensors feature two types, one that is effective at f5.6 or faster, and a much more sensitive one that works at 2.8 or faster (more sensitive means more accurate). the sensors on a 40d are cross types that are f5.6 sensitive, and a center one that is also f2.8 I don't hate macs or OSX, I hate people and statements that portray them as better than anything else. Macs are A solution, not THE solution. Get a good desktop i7 with Windows 7 and come tell me that sucks for photo or video editing.
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How does this work when you select only 1 AF point, like the center one? Would that actually encompass the whole center circle? Regards,
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Sep 15, 2007 17:58 | #5 canon shooter, Sony A6400, A6500, Apeman A80, & a bunch of Lenses.............
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pcmac Mostly Lurking 12 posts Joined May 2007 More info | Sep 15, 2007 18:00 | #6 Hi all,
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JuanZas Goldmember  1,511 posts Joined Aug 2005 Location: Madrid - ESP More info | Sep 15, 2007 18:21 | #7 According to the white paper, the AF sensor points of the 40 D are: IMG NOTICE: [NOT AN IMAGE URL, NOT RENDERED INLINE] 9 AF cross type sensors, as others has explained sensitive to the contrast change in horizontal & vertical lines with support to f/5.6. But this camera is provided with the world first diagonal high-precision cross-type AF at center point with f/2.8 and faster lenses, (in blue in the picture). This is a novelty, so I have to assume that now the central point is sensitive to change in contrast in diagonal lines too ... when you use lenses with f/2.8 or faster ... that´s in improvement, but I don´t have a 40D and I can not explain how this can affect to central AF performance ... I have to assume that with f/2.8 lenses, the focus performance for the central AF point is increased ..... Cheers
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