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09-28-2010, 06:19 PM   #1
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Left side of frame out of focus? K10D

I'm having an odd, intermittent problem with my K10d. Occasionally, a shot will be out of focus/blurry on the left side of the frame. It's happened in situations where I can't believe it's my fault, like this shot- lens at 22mm, focused at infinity, f8 and 1/750, so I don't think it could be a focus, depth of field or camera shake problem. It's happened at different focal lengths, and at different focusing distances. I use a Sigma 18-200 lens. Any thoughts would be greatly appreciated.

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09-28-2010, 06:39 PM   #2
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It's possible the lens elements or/and the sensor are misaligned. Do you have another lens to test?

Last edited by hcarvalhoalves; 09-28-2010 at 06:45 PM.
09-28-2010, 06:55 PM   #3
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Looks like a de-centering problem on the lens. That is if the focus point is in dead center, both left and right sides should have equal sharpness.
09-29-2010, 05:17 PM   #4
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Kind of hard to say, though, given the small size of image posted. Can you post unresized crops from both sides?

09-29-2010, 05:25 PM   #5
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If it is intermittent, then it probably isn't the sensor.

Have you taken a test shot of a wall? Being perpendicular to a flat, textured surface like a brick wall can help identify the characteristic of problems like this.
09-29-2010, 06:13 PM   #6
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QuoteOriginally posted by JonPB Quote
If it is intermittent, then it probably isn't the sensor.

Have you taken a test shot of a wall? Being perpendicular to a flat, textured surface like a brick wall can help identify the characteristic of problems like this.
I was about to suggest that. Or a big sing with letters Being perpendicular to.
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