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Old Jan 22, 2010, 12:26 PM   #11
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MG..thanks for posting links to pix...it shows us what to look for.
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Old Jan 22, 2010, 1:07 PM   #12
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Here are the samples I shot today. All but the wood fence were shot indoors from about 15 feet using flash at 100 iso. They were shot between f5.6 - f16
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Old Jan 22, 2010, 1:08 PM   #13
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MG..thanks for posting links to pix...it shows us what to look for.
Yes thanks so much for the links. Very helpful.
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Old Jan 22, 2010, 2:17 PM   #14
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These are resized, full frame pictures? It's best to look at the full sized pictures, but these don't look like a centering problem to me - the right and left sides look about the same. The focus doesn't look bad, but you might want to read up on focus charts (there are a number of them available on the internet, some better than others) and how to use them. The last one I used I found by google, and had light grey parts that the focus sensor can't see, helping you make sure you actually focus where you want to.
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Old Jan 22, 2010, 2:17 PM   #15
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Here are the samples I shot today. All but the wood fence were shot indoors from about 15 feet using flash at 100 iso. They were shot between f5.6 - f16
they look ok to me..Tony The brick ones are too large it would be better to be further away I think. The wood fence maybe a little fuzzy....but it seemed uniformly so. If it were me I'd try and manually focus...and see if there's a difference.

I am interested as I have the same lens.....so just in case...LOL
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Old Jan 22, 2010, 2:23 PM   #16
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Only thing I've seen so far is that you like to underexpose your shots!
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Old Jan 22, 2010, 2:23 PM   #17
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So then the lens is ok, right?
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Old Jan 22, 2010, 4:45 PM   #18
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One way to decide for yourself is to take that first brick wall picture, do a 100% crop for (say 500-600 pixel square) at the middle left, center and middle right. Put the left and right crops next to each other and see if one looks blurrier than the other. It's harder to see it when you resize the full frame to post here. From what you shown here, I would guess that the lens is fine but one can't tell for sure without seeing the full sized pictures and comparing the sides.

I do think that the next step for you would be to shoot some focus charts. Here's the web page of the chart I used most recently, I found it one of the better ones ( http://regex.info/blog/photo-tech/focus-chart ). Follow the instructions. I printed the 10% version and it worked correctly with my K-7 - it couldn't focus on the grey but did focus on the black (which is the point, try it to make sure).
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Old Jan 24, 2010, 6:21 AM   #19
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I think that in the first shot that the selective focus is what seems out

so I tried an edit with selective focus and brightening
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Old Jan 24, 2010, 6:50 AM   #20
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To check your lens take a newspaper and tack it to the fence and shoot the paper. Sharp or fuzzy areas will show up easily. Be sure you shoot exactly square on.
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