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01-21-2010, 12:48 PM   #31
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There's a huge ongoing discussion of sharpness problems in the KX on dpreview.com. But that problem seems to be associated with the SR system, and occurs in handheld (or even tripod-mounted) shots taken at 1/60 to 1/125 sec. Pixel-peeping shows what appears to be motion blur. Manteiv's comparison shots are all with flash, which should eliminate such motion blur with the flash duration of approx. 1/1000 sec.

01-22-2010, 09:51 AM   #32
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here are two images re-taken

I re-took two images following your recommendations of using F8 instead of F22

Here new samples pics

I am happy, the images are much sharper.

Look at the image of the glasses with the gold painting, if you zoom in, the fine details can be visible very clearly. You can see quite clearly the 3D of painted flowers.

On the picture of the Greek jar, you can clearly see the asperity and the grains of the jar surface.

So one question remains: why was I able to see the details with my former K110D shot at F22 whereas on the K-x, I cannot, unless I shoot at F8?

Is that because of the different lens? (DA 18-55mm vs DAL 18-55mm?)

Thanks everyone for your input, I learned something new. I had always thought that shooting the smaller aperture the better to achieve better sharpness. I guess from now on, I will be aware of the lens' diffraction limit.










Last edited by manteiv; 01-22-2010 at 12:25 PM.
01-22-2010, 10:42 AM   #33
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here is a link which talks about diffraction at smaller aperture (with examples)

Diffraction and Optimum Aperture - Format size and diffraction limitations on sharpness
01-22-2010, 10:43 AM   #34
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The short answe is more pixels, small compact P+S cameras hit diffraction at something like f/4 or 5.6.

Pixels/Sensor size.

01-22-2010, 12:03 PM   #35
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QuoteOriginally posted by ma318 Quote
here is a link which talks about diffraction at smaller aperture (with examples)

Diffraction and Optimum Aperture - Format size and diffraction limitations on sharpness
Excellent article!
Thanks for sharing.
01-22-2010, 12:17 PM   #36
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Good to know you found it informative. The author did a very good job and deserve the credit.
Sharing idea is why I like this forum.
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