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D300/24-70mm focus problem

stevefu

US
12 posts

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stevefu Registered since 31st Dec 2006
Tue 05-Aug-08 06:29 AM | edited Tue 05-Aug-08 06:47 AM by stevefu

I have a D300 and recently got my 24-70mm/2.8. Life should be good. Well, not really.

I have never been someone who spends a lot of time testing equipments. I guess I have been lucky. But then I recently noticed something wrong with my new toys: when I took some portrait photos with the D300/24-70 combo, if I set my D300's focus point to the top of the image, it always came out a bit soft. If I focus at the center, it is incredibly sharp. After a lot of tests (tripod, flash, cable release, try other lens, etc), I sent the lens to Nikon for repair, and got it back today. Alas, the problem is still there.

So to illustrate my point: here are two images:

center focus: http://www.flickr.com/photos/stevexfu/2734673254/sizes/l/
focus area at 100% of above image: http://www.flickr.com/photos/stevexfu/2733884283/sizes/l

right focus: http://www.flickr.com/photos/stevexfu/2733843185/sizes/l/
focus area at 100% of above image: http://www.flickr.com/photos/stevexfu/2734717104/sizes/l/

You can see when setting the focus point to the far right, the image is noticeably softer. I notice similar behavior with other lens, but much less degree than the 24-70mm/2.8. Certainly more so at f/2.8 than at smaller aperture.

Now I am not sure if it is my D300's problem, or if I have unrealistic expectations. Is that kind of softness expected at the edge of the lens (at f/2.8)? Or should I now send my D300 for Nikon to check it?

Thanks for reading.
-Steve

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Reply message RE: D300/24-70mm focus problem
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Reply message RE: My guidance is try another test target.
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Reply message RE: My guidance is try another test target.
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                    Reply message RE: 24-70 AF "issue" possibly explained"
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