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Thread started 17 Jul 2007 (Tuesday) 04:41
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Front or back focusing? Please help!

 
segasaturn
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Jul 17, 2007 04:41 |  #1

Hi. Just got a 50mm 1.4. It's sharp!

However, I noticed that in real life tests, it appears to front focus a little. And with f1.4, that slight DOF difference appears to be unforgiveable. When I did the focus test chart, it appeared perfect at 1.4. Then, opposite of what i was expecting, when I moved the aperture from 1.4 slowly to 8 I noticed that the focus seemed to drift upwards (backwards) on the paper. Is there something wrong with the lens, the camera, or me?

Is this common? User error?

I'm using a 1DMKII.

Thanks in advance.


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segasaturn
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Jul 17, 2007 04:47 |  #2

Here's the real life tests. The focus point was on the eyes, but it looks like the hair, which was slightly in front of the eyes, was in focus. These are almost 100% crops.

I'm using AI servo with manually selected focus points, so anything out of focus should not be because of recomposition. Or maybe I'm doing something terribly wrong...

Thanks.

edit: actually, the 2nd pic seems to be in focus.

1st pic - f1.6 1/640
2nd pic - f2.0 1/320


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sando
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Jul 17, 2007 04:50 |  #3

Looks fine to me, tb(perfectly)h.

The thing with DoF is that when you focus on something, the OoF part will extend further back than it does forward.


- Matt

  
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kuma1212
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Jul 17, 2007 22:52 as a reply to  @ sando's post |  #4

I just got a 50 1.4 and also seem to have front focusing (at 1.4). I have not used a focus chart yet. I'll post some pics when I get a chance to test the lens more.


5DII. 50L. 24-70LII. 16-35LII. 70-200is2.8II. 100L 135L.

  
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Front or back focusing? Please help!
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