QUOTE(Everdying @ Mar 21 2011, 07:48 PM)
I thought d3100 got 11 focus points.
Anyway not sure how fast d3100 can track, but u should explore its 3D-tracking feature if its just 1 person etc...
else i would just use single point af-c...unless u really trust one of its 11 points in dynamic to actually lock on to what u want to focus.
Sorry, is 11 focus point.
I tested yesterday. I will stick to AF-C + Single point , because i can predict my subject.
Im using AF-ON btw.
http://imaging.nikon.com/products/imaging/...speed_accuracy/The above site got very nice info about it although is D3X , but still can applied in every nikon camera.
Added on March 21, 2011, 7:59 pmhttp://imaging.nikon.com/products/imaging/technology/d-technology/autofocus/02sensor/index.htm
Added on March 21, 2011, 8:46 pmOne more , when im using AF-C+ Single Point with AF-On.
Let say im shooting stationary thing. I use af-on to focus , then i release the af-on but my focus does not lock one . Is it because my camera AF-on different with high end camera body? (i set my AE-L,AF-L button to become AF-On)
----------------Info---------------------------
How to use the AF-On technique in the field
To emulate single-servo mode (focus/recompose/shoot)
Place the active AF point on your subject
Press the AF-On button to acquire focus
Release the AF-On button to lock focus
Recompose and shoot
To focus continuously on a moving subject
Place the active AF point on the subject
Press the AF-On button
Keep the AF-On button pressed to track focus while simultaneously pressing the shutter release
Remember to initiate the VR system (if your lens supports it) by half-pressing the shutter button prior to releasing the shutter. Remember, VR takes about a half-second to stabilize, so youāll want to anticipate your subject.
http://www.luminescentphoto.com/blog/2010/...f-on-technique/This post has been edited by SSY22: Mar 21 2011, 08:48 PM