Forum: Pentax K-3 & K-3 II
12-07-2017, 09:34 PM
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Hello enricoman,
You might have some dust or similar on the phase detect sensor.
You could try mirror-up cleaning with a rocket blower (Giotto or similar) whilst holding the camera mount facing down.
If there is any foreign matter there it will affect the focussing.
Let's know how you get on.
Cheers,
Terry
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