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Archive 2008 · Dreaded MkIII OOF shots?

  
 
morganb4
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p.2 #1 · Dreaded MkIII OOF shots?


I took a bunch of shots the other day, focused on a window, trees in front but the line of sight between centre AF and window was clear yet the cam repeatedly focused on the tree, as if it was being influenced by data from the adjcent AF point.

odd.



Sep 27, 2008 at 08:25 AM
Numfar
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p.2 #2 · Dreaded MkIII OOF shots?


That looks like the problem. I have about 500 shots from Alaska that look like that.


Sep 27, 2008 at 08:28 AM
morganb4
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p.2 #3 · Dreaded MkIII OOF shots?


Numfar wrote:
That looks like the problem. I have about 500 shots from Alaska that look like that.



annoying...



Sep 27, 2008 at 08:47 AM
Gravitytoy
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p.2 #4 · Dreaded MkIII OOF shots?


Keep in mind your depth of field. If you're using a focus/recompose method, it's pretty easy to move the plane of the sensor around enough to throw the shot OOF. I also have the Mark III, and I do sometimes get weird OOF shots, but none look like yours. In my OOF shots, there is no discernible focus area at all -- Everything is soft and blurry. In your shots, it appears that the camera did focus on something... just not what you intended. Knowing how difficult it can be to work with narrow DOF conditions, I would urge you to test your combo out in more controlled conditions using a tripod and a static subject. Otherwise there are too many variables (and too much bad mojo about the Mark III) to solicit any kind of rational opinion from the shots you posted. Good luck, and I hope you get it all sorted.
-Rich



Sep 27, 2008 at 09:22 AM
morganb4
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p.2 #5 · Dreaded MkIII OOF shots?


Gravitytoy I agree, if its front focused its kinda tricky for the OP to see so he needs a controlled test with a bunch of foreground clutter too.


Sep 27, 2008 at 09:28 AM
morganb4
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p.2 #6 · Dreaded MkIII OOF shots?


I tried this and it still looked like it was considering data from adjacent points, I only use On-Shot.

john660 wrote:
A VERY typical 1D III AF problem from my experience shooting wildlife with the various 1D Mk III bodies I have owned. In general, the camera works fantastically well in almost all situations for One-shot AF (as everyone knows, the Al Servo is a different issue altogether), but it has at least one serious flaw in it that causes front focusing and I'm pretty sure Canon still has no clue what's causing it. I find it occurs most in subjects that are black and white in a coloured setting, for instance, a badger in a sunny green field.

I have
...Show more



Sep 27, 2008 at 09:31 AM
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