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03-27-2012, 10:27 AM   #1
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16-50 on my K5

I've had the DA 16-50 F2.8 lens for just a little more than a year now and in my opinion has been working completely fine with my K-5 up until two weeks ago. Out of now where, the camera or lens (as I'm not quite sure which) refuses to focus even if I have it set on AF on both the camera and lens. I have to switch the lens to MF as well as the on camera to M as it doesn't work on AF-C or AF-S setting. The shutter won't release unless it manually focused. The strange thing is, when I put the 16-60mm on my K10D to see if it's my K-5 or the lens that is acting funny, it works perfectly. Here's the kicker, tried out my 50mm and my 25-75mm onto the K-5 and those are focusing on the camera.

Is this a SDM problem with my lens? Or is my K5 acting up (which I had for less than a year) If so, any advice on what I should do to get this fix as the 16-50 + K5 was my walk around kit (even with the heavy weight :[)

Much appreciated in advance for all your help! I love this forum.

03-27-2012, 10:57 AM   #2
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The K10D with some older firmware versions still uses screw drive; not sure which version was the first to support SDM; you can research that and compare with the version that you have on the K10D.

If other lenses on the K5 work fine, my guess will be that it's a SDM problem. If there's a shop around that sells Pentax, you can try it out there. Else you can send both 16-50 and K5 in to the local repair facility so they can eliminate.
03-27-2012, 11:00 AM   #3
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based on what is described, it is very likely to be SDM issue since the k-5 will not support screw drive on lens with SDM but the k10D will depending on the firmware (older release will support).
03-27-2012, 11:14 AM   #4
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Make sure that your battery is fully charged and try it again. Also try focusing manually and then try auto focus again.

03-28-2012, 12:57 AM   #5
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+1. My 50-135 had similar issue on my K200D. But with fully charged batteries (4xAA),it works like a charm.

QuoteOriginally posted by foxhead Quote
Make sure that your battery is fully charged and try it again. Also try focusing manually and then try auto focus again.
03-29-2012, 12:39 PM   #6
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You're refering to the SDM problem :\...

I was quoted 300 for fixing it on my 50-135..

Do this.. just work slowly in clean space with bright light.

DIY SDM repair v1.0
03-30-2012, 06:24 AM   #7
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Yep, sounds like SDM problem. I just sucked it up and paid $290 to have mine repaired (plus another $290 for my 50-135).
03-30-2012, 08:21 AM   #8
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$300... O u c h!!!!

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