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<blockquote data-quote="WayneF" data-source="post: 288153" data-attributes="member: 12496">I am puzzled by the distinctions too.&nbsp;&nbsp; This is really not my subject,&nbsp; I can just read the manual.D90 and D3100 both say they have the Multi-CAM 1000 module, Phase, with 11 focus points.&nbsp; Both say their Live View is Contrast, anywhere in frame.Both seem to use 3D as a synonym for 11 points &quot;3D tracking (11 points)&quot;.&nbsp; Both allows user to select initial focus point.Both have Auto Area, where camera detects subject and selects initial focus point.D300 does make a distinction.&nbsp;&nbsp; The D300S has the same choices, but it adds a lot more words (D800 says exact same words):Single point focus - use for stationary subjects9 points - for subjects moving predictably - runners or race cars on a track21 points - unpredictable motion - football players51 points - moving quickly, not easily framed - birds51 points 3D - subjects moving erratically side to side - tennis players.&nbsp; Adds if they leave the frame, remove finger from shutter.No clue what 3D does.Also has Auto Area, where cameras selects subject and initial focus point.More points gives camera much more choice to find a subject.Fewer points obviously let us confine it closer to the subject.&nbsp; Which must be good, because it is provided.</blockquote>

[QUOTE="WayneF, post: 288153, member: 12496"] I am puzzled by the distinctions too. This is really not my subject, I can just read the manual. D90 and D3100 both say they have the Multi-CAM 1000 module, Phase, with 11 focus points. Both say their Live View is Contrast, anywhere in frame. Both seem to use 3D as a synonym for 11 points "3D tracking (11 points)". Both allows user to select initial focus point. Both have Auto Area, where camera detects subject and selects initial focus point. D300 does make a distinction. The D300S has the same choices, but it adds a lot more words (D800 says exact same words): Single point focus - use for stationary subjects 9 points - for subjects moving predictably - runners or race cars on a track 21 points - unpredictable motion - football players 51 points - moving quickly, not easily framed - birds 51 points 3D - subjects moving erratically side to side - tennis players. Adds if they leave the frame, remove finger from shutter. No clue what 3D does. Also has Auto Area, where cameras selects subject and initial focus point. More points gives camera much more choice to find a subject. Fewer points obviously let us confine it closer to the subject. Which must be good, because it is provided. [/QUOTE]

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