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09-06-2017, 12:14 PM   #1
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Pentax K-S2 autofocus problem

Hey all, just picked up a Pentax ks2 and I've run into a curious situation with the auto focus.

In live view, autofocus is snappy and accurate. Autofocus even works in movie mode (slow and noisy, but it gets there). Manual focus using the back lcd presents no problems (focus peaking, magnification, etc. All working).

But using the viewfinder, autofocus just won't lock on, with or without the af assist light, indoors or outdoors. I've tried all the shooting modes, af modes, etc. And nothing seems to make the camera lock in focus via. The viewfinder. I can't even get the red focus confirm square to show. The camera just racks through the entire focus range, back and forth.

Tested so far on three different lenses (18-50 wr re, Sigma 24 2.8 af, Tamron 18-200) and nothing seems to work. The Ks2 is in great condition, low clicks ( <1000), 1.1 firmware, no signs of damage. I've reset the settings and everything, and it's driving me nuts.

Any clue as to what's causing this issue? My google-fu turns up nothing.

09-06-2017, 12:52 PM   #2
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Have you inspected the mirror box for dirt / damage? Could be that the AF sensor is obstructed somehow.

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09-06-2017, 04:51 PM   #3
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Yeah, i took a look inside, even flipped the mirror up. Nothing seemed out of the ordinary. I'll take a closer look at home later using diagrams and such.
07-22-2018, 02:21 AM   #4
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Hello,

Same problem here. Did you find solution?

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