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Saturday, October 17, 2009

Once Again, K-7 SR Issue that Causes Horrible IQ

Further to the last reports of the issue, it seems that the SR system of at least quite some K-7 units are having problem. See the latest report from yet another K-7 user just a few days ago:-

http://pentaxforums.com/forums/showthread.php?t=75494

Sample pictures with central crops are posted. It really looks horrible, as the poster writes. It just shows that the SR just *Added* Shakes, instead of reducing it, when the SR function was turned on.
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Guest's avatar

Guest · 804 weeks ago

wasn't it proven to be a polarizer?
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Tim's avatar

Tim · 803 weeks ago

Nope. As it looks this problem is due to a problem with the focal length for the SR. For some reason SR thinks the lens is longer than it is causing it to overcompensate. Can't be proven in this case because EXIF is not fully there, but this has happened elsewhere!
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Ivan's avatar

Ivan · 803 weeks ago

It looks to be a combination of issues. The user had a polarizing filter on, which reduced available light by a couple stops and reduced image quality. Shooting aperture priority, the camera dropped the shutter speed to 1/200th or slower, and the poster said it "was VERY windy out there." Wind blur plus the filter is what dragged those images down.

The SR system will compensate for a moving camera, but not a moving subject.

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