Does the tokina variations of these lenses have SDM like the 50-135?
If it were me I would just use the screw drive. SDM sucks anyways. I'd
be thankful pentax put in a screw drive for backwards compatibility, I
imagine they will get away from SDM entirely with new lenses.

On Thu, Aug 22, 2013 at 7:42 AM, SV Hovland <[email protected]> wrote:
> I have tested this on my own K-7 and DA*16-50. I wanted to find out if this 
> is a good solution for me and I did the test before the warranty went out. I 
> found it to be perfectly good. It focuses just as fast as SDM, but with more 
> noise of course. So I decided to not send my lens in and complain about slow 
> SDM after all. I could wait to complete break down and continue with the 
> "old" focusing instead.
>
> Regards
> Stig Vidar Hovland
>
> ________________________________________
> Fra: PDML [[email protected]] p&#229; vegne av Boris Liberman 
> [[email protected]]
> Sendt: 22. august 2013 09:09
> Til: Pentax-Discuss Mail List
> Emne: Re: Giving up on Pentax (probably)
>
> Well, it was easier than I thought.
>
> Here is the link:
>
> http://www.pentaxforums.com/forums/pentax-slr-lens-discussion/208353-how-deactivate-sdm-silent-autofocus-allow-screw-drive-autofocus-da-16-50mm-f-2-8-a.html
>
>
> On Thu, Aug 22, 2013 at 9:49 AM, Chris Mitchell
> <[email protected]> wrote:
>> Hi all
>>
>> The last straw has been that my DA* 16-50 has stopped auto-focussing
>> again. The internal motor was replaced a couple of years ago (so out
>> of warranty) and now it looks like there's another couple of hundred
>> quid to be spent on it. And yes, I've cleaned all of the contacts and
>> yes, my DA* 50-135 works OK on my only remaining K-7 body.
>>
>> So the decision's nearly made to sell off the K-7, DA* 16-50 (either
>> repaired or as is), DA* 50-135, a lovely F*300 4.5 (the one with the
>> tripod mount), an FA-135 2.8 (probably my favourite lens ever) and an
>> FA-50 1.7. I'll put the proceeds towards a backup Fuji X body and get
>> the excellent 55 - 200 zoom to cover the long end of the range and to
>> sit alongside my growing collection of Fuji X primes. I'll keep a
>> number of MF lenses so may still be able to appear in the PDML
>> annual...
>>
>> Any guidance on how to price? Or if anyone's interested in making me
>> any sensible offers, contact me off list and I'll get more details and
>> photos arranged and we can sort out logistics.
>>
>> Yours sadly, Chris
>>
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>
>
> --
> Boris
>
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