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08-05-2016, 04:24 PM   #1
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Pentax K3 will not Focus or take photo

I have this problem on and off. Pentax K 3 with Pentax DA 16-50, f 2.8 lens. Can't focus auto or manual and shutter will not fire. Problem lingers and then disappear.

08-05-2016, 04:28 PM   #2
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only with that lens or does it happen with other lenses also?
08-05-2016, 04:30 PM   #3
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If the image is not in focus, the shutter won't release in AF-S mode when focus priority is set- that's normal.

But if the camera is struggling to confirm focus on something that shouldn't be a challenge, there might be something wrong with the AF module.

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08-05-2016, 04:42 PM   #4
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QuoteOriginally posted by Adam Quote
If the image is not in focus, the shutter won't release in AF-S mode when focus priority is set- that's normal.

But if the camera is struggling to confirm focus on something that shouldn't be a challenge, there might be something wrong with the AF module.
Well, it doesn't function in manual focus or even Green auto. Problem then just disappears.

08-05-2016, 04:54 PM   #5
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QuoteOriginally posted by markduq Quote
I have this problem on and off. Pentax K 3 with Pentax DA 16-50, f 2.8 lens. Can't focus auto or manual and shutter will not fire. Problem lingers and then disappear.

My 16-50 was starting to do the same thing until I, #1- cleaned the contacts on both lens and camera, #2- turn the camera on with the 16-50 attached and get some power going through that troublesome capacitor weekly as a minimum. I was finding that the focus ring was turning but not changing focus. After a couple of minutes on the turned on camera. the focus would change manually, once it would change manually it would also autofocus. Do not let it sit for too long without having power going through it and all should be well. Unless you are showing the 1st signs of SDM failure. Good luck.


PS. How old do you think your copy is?
08-05-2016, 05:03 PM   #6
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What is SDM failure? I just had this camera cleaned by Pentax
08-05-2016, 05:22 PM   #7
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QuoteOriginally posted by markduq Quote
What is SDM failure?

Prior to 2012, " SOME " AF motors in primarily the DA* 16-50 and DA* 50-135 failed and stopped working. Many theories abound and there are many threads on the topic on the forums. The problem was supposed to have been fixed after 2012 with an improved motor. That is why I asked how old you thought your lens was. In the " search the forums " box, type in 16-50 SDM failure and read some of the threads. Your lens may or may not have SDM failure. Only time will tell. But keep power going through it regularly, as I have, and all should be OK.


PS. Both the 16-50 and 50-135 are great lenses, and the " fear " of SDM failure should not stop anyone from getting either of these lenses IMO.

Last edited by pjv; 08-05-2016 at 05:30 PM.
08-05-2016, 06:09 PM   #8
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This was very helpful

08-05-2016, 06:18 PM   #9
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QuoteOriginally posted by markduq Quote
This was very helpful

Glad to help Mark. Good luck.
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