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07-13-2015, 12:10 PM   #1
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DA* 200 and 300 screwdrive conversion

I successfully (and easily) converted my DA* 200 and DA* 300 lenses to screwdrive. I was curious about this and my searches only yielded conversions for the DA* 16-50 and DA* 50-135. The AF on my 200 and 300 work fine, but I was still curious. Partially since my 16-50 and 50-135 needed to be converted and the screwdrive AF works noticeably better on those lenses. The conversion on the 200 and 300 was successful, but I preferred the SDM on those lenses so I switched it back to SDM. Just wanted to let people know that the conversion is possible (in the case of a dead SDM) on these lenses and was similar to the 16-50/50135, changing the C0 value to 80, just less of them to change in the file (I'm guessing because they are primes compared to zooms). I don't have a 60-250 to test this on but I would think that it would be similar? Just wanted to share that with everyone in case someone had a dead SDM on their 200 or 300, though they aren't as prevalent as the 16-50/50-135 SDM motors going bad.

07-13-2015, 12:32 PM   #2
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Can this be done with any Pentax DSLR? And how?
07-13-2015, 01:55 PM - 1 Like   #3
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QuoteOriginally posted by stillshot2 Quote
Can this be done with any Pentax DSLR? And how?
I did it with a K-5 (no luck with my K-3). I believe K-5 and earlier models can do it. The files required to access the debug may vary.

You can check out the thread for more info:

It's a long thread at this point so may require some searching for the proper files to create for your camera.

Last edited by transam879; 07-13-2015 at 04:37 PM.
07-13-2015, 03:46 PM   #4
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Great news!

07-14-2015, 11:38 AM   #5
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does NOT work with 60-250. At least, not with any instructions out there for the other lenses. You end up with the SDM and screw drive fighting or something and it won't focus reliably at all.
07-14-2015, 05:27 PM   #6
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I did it with a K-5 (no luck with my K-3).
Thanks for the info. Darn. I only have a k-3 and my DA300 sdm has died for the third, and I expect final, time.
11-03-2017, 05:54 PM   #7
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So any experiences about AF performance after conversion to screwdrive?

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