D300S why not always use 51 points 3D tracking in AF-C ?

Started Apr 3, 2010 | Discussions thread
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olyflyer
olyflyer Forum Pro • Posts: 23,965
Re: D300S why not always use 51 points 3D tracking in AF-C ?

RobertMartinu wrote:

ccarrier wrote:

When I use Continuous Autofocus (AF-C) what are the advantages of not using the 51 points 3D tracking ? Why shoud I use the 21 points, 9 points or single point ?

Think of situations that make spot metering desireable.

In 3D-tracking the camera always uses the center point, with the other modes metering is linked to the inital AF point.

Spot metering meters a 3 mm circle (about 2% of frame) centered on selected focus point (on center focus point only when non-CPU lens is used). I am pretty sure this is the case even in 3D-tracking. Center weighted meters around the center of the VF.

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tyb
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