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12-11-2011, 01:01 PM   #1
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da 50-135 misaligned glass or what??

So, what do you think of this? The images are from the far left corner and the far right corner, 100% crops. There is probably some shake blur as well but this does not look good. If you look at the lamps the left one looks OK and the right one looks like crap.
It was taken at 135mm, 1/180s f4.5.
I have seen some softness in the right part of some other images too, but sometimes it looks good. I noticed this only with my new K5 and not with the older house i got.
But i assume it has to do with the lens. Any ideas?? Could it be a misaligned element??





12-11-2011, 01:31 PM   #2
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Shooting random 3D scenes and looking at them like this is not the best way to go about assessing lens problems.

Put your camera on a tripod and carefully, in good light etc, shoot some flat ISO 12233 test charts (a printable PDF is downloadable from there) at various focal lengths and apertures, adjusting your position at various focal lengths to always fill the frame with the test chart.

Eg do some shots at 50mm at f2.8, f5.6, f8, ditto at 100mm, 135mm etc. Then it will become clear whether you have a problem with the lens, and where it shows up.

De-centred lens elements are pretty common.
12-11-2011, 04:21 PM   #3
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The 2nd one suffers from severe motion blur and thus useless for comparison. Redo on tripod with 2s timer if possible.
12-11-2011, 05:14 PM   #4
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Original Poster
thanks for replying!

Yes I will do a proper test, but just noticed it today and got curios.
And to images are from the same photo, just weird that the right corner looks like it suffers from motion blur and the left corner does not.

12-12-2011, 01:16 PM   #5
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Not at all surprising
That is typical of a snatched shutter press, which causes rotation more often than simple linear motion. This is the hardest of motion blurs for SR to eradicate. You have been given good advice already, but it cannot hurt to repeat it. Use a tripod and do a proper test. Otherwise you will be chasing shadows and making erroneous judgements, when your lens is probably not at all at fault.
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