AF trouble with K5 and DA 50-200mm ED Lenses

Recently I had a problem with my new K5 and DA 50-200mm ED Lenses (I have two of them). After putting this lens on the K5, the camera used to struggle to adjust AF and give out a continuous sound as an indicator. I found this out after trying all the other lenses first. It only occured with that lens. The problem is that when you put the lens on, you twist it until it stops,then you have the problem. The trick is to give it a little backward turn to make it click, then everything is OK! I have no such problem with my K20D though. I just wanted to post this to save people from distress.

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Regards,
Nezih

I think it would be worth an email to Pentax Technical to make them aware of this. I would expect the lens to fit and align the AF drive without having to fiddle like this. Hopefully they may bring out a fix
Regards David

I did, David, ask them what to do first and they wanted me explain the very noise the camera AF motor or whatever emits. Then I just wrote them
the solution I found and even mentioned this forum post. Wanted them to let me know what they think. So, I'm waiting for an answer. Let's see..

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Regards,
Nezih

We will wait and see as I seem to think someone else on the forum mentioned a similar K5 noise, which from what you say sounds as if it may have also been the AF motor drive not engaged.
Regards David

Most probably!

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Regards,
Nezih