Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-13-2015, 12:10 PM   #1
Site Supporter
Site Supporter




Join Date: Feb 2011
Location: Syracuse, NY
Posts: 644
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
Pentaxian




Join Date: Sep 2013
Location: Phoenix, AZ
Photos: Albums
Posts: 661
Can this be done with any Pentax DSLR? And how?
07-13-2015, 01:55 PM - 1 Like   #3
Site Supporter
Site Supporter




Join Date: Feb 2011
Location: Syracuse, NY
Posts: 644
Original Poster
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: https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/208353-how-...m-f-2-8-a.html

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
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 10,328
Great news!

07-14-2015, 11:38 AM   #5
Loyal Site Supporter
Loyal Site Supporter
narual's Avatar

Join Date: Jun 2013
Location: South Bend (Notre Dame), Indiana
Posts: 1,956
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
Pentaxian
ChatMechant's Avatar

Join Date: Jun 2010
Location: Santa Cruz Mountains
Photos: Gallery
Posts: 766
QuoteQuote:
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
Site Supporter
Site Supporter
angerdan's Avatar

Join Date: Feb 2015
Posts: 226
So any experiences about AF performance after conversion to screwdrive?
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
200, 300, af, conversion, da*, k-mount, lenses, pentax lens, screwdrive, screwdrive conversion, sdm, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
DA* 200 and 300 are formally labeled "Not compatible with full-frame" grahame Pentax SLR Lens Discussion 22 02-22-2015 10:57 AM
Which TC for the highest quality on DA*200, DA*300 and/or FA*300 stl09 Pentax SLR Lens Discussion 22 02-15-2011 10:23 PM
diagonal out of focus lines w/ da*200 and *300 lenses? kauaiguy Pentax SLR Lens Discussion 5 07-11-2010 01:29 PM
I've read the reviews - still need help -DA 50-200, FA 75-300, DA 55-300 Neisey Pentax SLR Lens Discussion 7 08-22-2009 08:43 AM
DA* 200 and DA* 300 CapitaineAbitibi Pentax SLR Lens Discussion 4 04-07-2008 03:48 AM



All times are GMT -7. The time now is 06:11 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top