2 serious bugs with 3D tracking and metering

Started Dec 1, 2007 | Discussions thread
OP jp Senior Member • Posts: 1,151
I agree on both your observations

VadimOm wrote:

I was able to re-produce this test and observed the exact behavior
the OP is describing in #1

Glad you can confirm it

I now have my second D300 and it has exactely the same behaviour as the first one

(nothing wrong with the first but solt it to a friend who desperatley needed one and I was on another waiting list so got the other one 2 days later)

, but only when using Matrix metering (not
spot):

You are right, I coorected that wrong observation already.

Spot does not follow automatically traked point but does follow initially selected point.
http://forums.dpreview.com/forums/read.asp?forum=1039&message=25842631

As you can see, not only did the focus change (now the lens is in
focus, while the manuals are not), but also metering adjusted as
well, attempting to expose for the subject in focus, while blowing
the manuals in the middle of the composition.

Now all the same settings as the above (1-5), except for

3) CF-A3 51 points with 3D tracking mode ON

Central AF point selected, focusing on the BAC 6.1 manuals again:

And now AF point shifted all the way to the left hand side, back to
the 70-200mm VR:

As you can see, while the focus did change, exposure did NOT. And the
only difference now is that 3-D tracking is ON, while first two
images were taken with 3-D off.

Exactly what I observed

Since in both cases we're utilizing the same metering (matrix), yet
it behaves differently, the only explanation I can think of is that
in 3-D tracking mode there is no link between metering and selected
AF point.

I have the same theory
How severe do you weigh in this 'problem'?

Spot metering, on the other hand, yields the same results with 3-D on
or off - metering DOES follow selected AF point.

Yes I agree, As said above, I corrected that observation

jp wrote:

With 51 field dynamic focus and 3D tracking of, the metering bias is
under the selected AF point

With 51 field dynamic focus and 3D tracking on, the metering bias is
under the center AF point, not under the selected AF point.

Please try the difference yourself: do exactely the same thing with
and without 3D tracking on.

first

1) focus mode selector: AF-C
2) AF area mode selector: Dynamic Area AF
3) CF-A3 51 points with 3D tracking modus on
4) Metering selector: Matrix metering
5) CF-C1: shutter realese AEL OFF

then

1) focus mode selector: AF-C
2) AF area mode selector: Dynamic Area AF
3) CF-A3 51 points (no 3D tracking)
4) Metering selector: Matrix metering
5) CF-C1: shutter realese AEL OFF

In first case, metering bias is on selected AF point
in second case metering bias is on center of frame

checked and double checked: it is perfectly reproducible every time
Try it with high contrasts in your scene (lamp versus dark wall for
example)
Make sure you do not change framing of the scene, only shift AF point
from dark to bright areas (do not forget to release the shutter when
moving af point when in 3D tracking mode)

Now I am really curious if this is just my camere that does this.
Hard to beleive
Please let me know your results.

Thanks everyone particpating

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