How to deactivate SDM and allow for screw drive autofocus with DA* 16-50mm f/2.8

**clackers** · 01-14-2015, 02:17 PM

Originally posted by wibbly

I didn't back up my lensrom

As an IT consultant my eyes widen when I encounter the phrase 'didn't back up'.

Good luck with your recovery attempts, though!

wibbly · 01-14-2015, 03:15 PM

I know I know. now send me your roms

onebeachbumm · 01-15-2015, 09:10 PM

Originally posted by Class A

Lens data is specific to each lens copy. It would normally not be a good idea to use someone else's lens data in one's own copy. It is likely that the lens will show FF/BF behaviour afterwards.

The correct approach is to modify one's own lens data by just changing the SDM flags in the data.

Since you are so knowledgeable, why don't you share the meanings of the flags and their values so that he has something to work with? Surly someone of your vast experience will help a fellow Pentaxian?

wibbly · 01-15-2015, 09:25 PM

I just found another 16-50.

I'll be selling my copy as a manual focus only for a song and a dance. I'm sure someone will take it. Lesson learned

5shot · 01-15-2015, 10:25 PM

Originally posted by wibbly

I just found another 16-50.

I'll be selling my copy as a manual focus only for a song and a dance. I'm sure someone will take it. Lesson learned

I'll give you $50 for it

wibbly · 01-15-2015, 10:27 PM

You're pretty close. Ill list it officially when my next one shows up

Class A · 01-16-2015, 07:02 AM

Originally posted by onebeachbumm

Surly someone of your vast experience will help a fellow Pentaxian?

Surely, you will find that extending sarcasm in general is not the most inviting approach for asking others to spend their leisure time to help you.

RossCo · 01-16-2015, 01:33 PM

So the SDM on my 16-50 failed for the second time and it is my go to lens so it was time to try to convert it to screw drive. The instructions say to use PKTether. I am a Mac user and PKTether does not work on a Mac. So I worked it out piecing the instructions together from the various posts. I got my 16-50 to work using my K7.

Attached is a PDF with the instructions and screen shots.

If you have any comments / corrections let me know and I will update the file.

Arizona Dave · 01-17-2015, 01:47 PM

I would like to thank all of the contributors to this awesome thread. I especially thank Driline and LFLee for the clear instructions in posts 274 and 386.

onebeachbumm · 01-17-2015, 02:32 PM

Originally posted by Class A

Surely, you will find that extending sarcasm in general is not the most inviting approach for asking others to spend their leisure time to help you.

I guess they do things differently DOWN UNDER?

---------- Post added 01-17-15 at 04:34 PM ----------

Originally posted by 5shot

I'll give you $50 for it

Hell, I'll give you $50 for it just for the chance to play with it and see if it can be patched/hacked to work with the screw drive.

---------- Post added 01-17-15 at 04:47 PM ----------

Originally posted by LFLee

continue from thread above!

5. Copy new lens config from memory card to EEPROM & test lens works in screwdrive mode
a. On the penultimate page again, there should be another option "LENS ROM SD=>CAMERA" - basically does the opposite of step 3a and copies your new datafile back to the EEPROM inside the camera/lens. It will say "VERIFYING" and go through the rows in the LENSEEP file until it's happy.
b. Press the menu key to exit the debug menu and check autofocus works and you can hear the screwdrive operating (easy to check with my lens as the SDM was dead - so activity meant success!)
Note: if you haven't edited the file properly, you probably won't find this step working... in my case, I had followed instructions for the DA*16-50 which only has 4 blocks rather than 8 to edit... I went back to my computer and made the other 16 edits and then it worked. So don't panic and take your time.

comment: the "LENS ROM SD=>CAMERA" option is here:
Attachment 250201

once you click "OK", the screen flash several message quickly (didn't manage to take picture, sorry). But I did see "VERIFYING : ...", and one of the message looks like this :
Attachment 250204
Then the screen goes back to development menu. You are done!

6. Use PKTether to turn off Debug Mode
a. Leaving your camera on, connect it via USB to the computer
b. PKTether should show that the camera is now connected and the camera should show "PC-5" or similar message in the top LCD
c. Choose "Camera Debug Mode Off" from the Debug mode menu
Done!

comment: this part is pretty easy, now enjoy the noisy screw drive, but working AF! accurate, and fast!

7. Tidy up memory card by removing "boot files"
As a final step, I deleted the "boot files" from the root directory of my memory card... I didn't want to leave them lying around just in case.

Read more at: https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/208353-how-...#ixzz3MCAB3DhA

Thank you for taking the time to list all the steps including photos... Just wish I had found this before three days of stumbling in the dark. But I have saved it for future reference. Again, many thanks!

---------- Post added 01-17-15 at 04:58 PM ----------

Originally posted by Arizona Dave

I would like to thank all of the contributors to this awesome thread. I especially thank Driline and LFLee for the clear instructions in posts 274 and 386.

Dave, is there any way to copy and save post #386?

wibbly · 01-17-2015, 04:50 PM

Onebeachbum, it does work with screw drive. that's not the problem. The issue is the lost focus cal data. So it will screw drive to incorrect focus

Arizona Dave · 01-17-2015, 05:50 PM

Originally posted by onebeachbumm

Dave, is there any way to copy and save post #386?

Yes. Click on the settings tab of your browser, Select FILE, and SAVE AS. I saved the pages I wanted as HTML files to the same folder as the other files I made for this project. If this thread disappears, I'll still have good instructions.

Darren M · 01-19-2015, 04:09 AM

It has been a very long time since I have participated here, but I came across this thread after having the SDM on a 16-50 go. Thankfully, I was able to make it work again and mostly I just wanted to express those thanks.

I did have some issues, so I will post what worked for me. Likely it was covered somewhere in the hundreds of replies, but I didn't see it. Forgive me if this is a repeat.

First, I don't know why, but I could not get PK Tether to communicate with either my K-5 or my K10D on either my desktop (Win 8/64bit) or on my Laptop (Win 7/64bit). Not sure why but I had no luck.
Fortunately though, and I am sure I found it in this thread somewhere, I was directed to this site: Debug mode
For the K10D, I made the MODSET.TXT file with the [OPEN_DEBUG_MENU] instruction and put that in the root directory of an SD card. Then, I started the camera with the card door open and the debug mode came up.
Then, I scrolled down until I came to the line saying, `LENS ROM SAVE to FILE` and I clicked on OK for that option. The camera saved a file titled LENSEEP.LNS to the memory card. I then took the card back out of the camera, backed up that file and then opened it with NotePad Plus. From there, I did a find and replace, where I replaced all `C0`text with `80`as was covered by LFLee in #386 of this thread. Then, I put the card, with the new LENSLEEP.LNS file into the camera, left the door open and started up the camera. Then, it was a matter of scrolling to LENS ROM LOAD from FILE and clicking ok. After that, it did take a few minutes, but the operation did finish and I then had auto-focus with the 16-50 again. Works on both my K10D and my K-5, just as it should.

Sorry if this is wordy, but I thought it might be of some interest, just in case others can't get PK Tether to work.

I am very happy and very thankful for the hard work that has obviously gone into this thread.

**clackers** · 01-19-2015, 12:27 PM

Originally posted by Darren M

For the K10D, I made the MODSET.TXT file with the [OPEN_DEBUG_MENU] instruction and put that in the root directory of an SD card.

That's already been documented a couple of times in this thread, though, Darren?

Good to see you're going, anyway.

LFLee · 01-20-2015, 10:33 AM

Originally posted by Aggie89

I have tried multiple times to convert a 60-250 to screw drive using this method. I have never gotten it to work.

Originally posted by leeak

Neither could I. Only one person claimed to have done it, but no actual prove. I was obviously skeptical.

The guy now told me that after some extensive testing with another guy, he said he didn't actually got the 60-250 to work...

so as of now no one confirm this trick work on 60-250.

01-17-2015, 01:47 PM	#429
Arizona Dave Pentaxian Join Date: Jul 2011 Location: Phoenix, Arizona Posts: 440	Woo Hoo! I now have a screw-drive 16-50. I would like to thank all of the contributors to this awesome thread. I especially thank Driline and LFLee for the clear instructions in posts 274 and 386.

01-19-2015, 04:09 AM	#433
Darren M Senior Member Join Date: Nov 2006 Location: Taipei, Taiwan Posts: 130	Thanks; very helpful. It has been a very long time since I have participated here, but I came across this thread after having the SDM on a 16-50 go. Thankfully, I was able to make it work again and mostly I just wanted to express those thanks. I did have some issues, so I will post what worked for me. Likely it was covered somewhere in the hundreds of replies, but I didn't see it. Forgive me if this is a repeat. First, I don't know why, but I could not get PK Tether to communicate with either my K-5 or my K10D on either my desktop (Win 8/64bit) or on my Laptop (Win 7/64bit). Not sure why but I had no luck. Fortunately though, and I am sure I found it in this thread somewhere, I was directed to this site: Debug mode For the K10D, I made the MODSET.TXT file with the [OPEN_DEBUG_MENU] instruction and put that in the root directory of an SD card. Then, I started the camera with the card door open and the debug mode came up. Then, I scrolled down until I came to the line saying, `LENS ROM SAVE to FILE` and I clicked on OK for that option. The camera saved a file titled LENSEEP.LNS to the memory card. I then took the card back out of the camera, backed up that file and then opened it with NotePad Plus. From there, I did a find and replace, where I replaced all `C0`text with `80`as was covered by LFLee in #386 of this thread. Then, I put the card, with the new LENSLEEP.LNS file into the camera, left the door open and started up the camera. Then, it was a matter of scrolling to LENS ROM LOAD from FILE and clicking ok. After that, it did take a few minutes, but the operation did finish and I then had auto-focus with the 16-50 again. Works on both my K10D and my K-5, just as it should. Sorry if this is wordy, but I thought it might be of some interest, just in case others can't get PK Tether to work. I am very happy and very thankful for the hard work that has obviously gone into this thread.

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01-14-2015, 02:17 PM	#421
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by wibbly I didn't back up my lensrom As an IT consultant my eyes widen when I encounter the phrase 'didn't back up'. Good luck with your recovery attempts, though!

01-14-2015, 03:15 PM	#422
wibbly Veteran Member Join Date: Nov 2014 Location: Edmonton Posts: 600	I know I know. now send me your roms

01-15-2015, 09:10 PM	#423
onebeachbumm New Member Join Date: Nov 2013 Posts: 19	Originally posted by Class A Lens data is specific to each lens copy. It would normally not be a good idea to use someone else's lens data in one's own copy. It is likely that the lens will show FF/BF behaviour afterwards. The correct approach is to modify one's own lens data by just changing the SDM flags in the data. Since you are so knowledgeable, why don't you share the meanings of the flags and their values so that he has something to work with? Surly someone of your vast experience will help a fellow Pentaxian?

01-15-2015, 09:25 PM	#424
wibbly Veteran Member Join Date: Nov 2014 Location: Edmonton Posts: 600	I just found another 16-50. I'll be selling my copy as a manual focus only for a song and a dance. I'm sure someone will take it. Lesson learned

01-15-2015, 10:25 PM	#425
5shot Senior Member Join Date: Feb 2009 Location: Washington - the State Posts: 208	Originally posted by wibbly I just found another 16-50. I'll be selling my copy as a manual focus only for a song and a dance. I'm sure someone will take it. Lesson learned I'll give you $50 for it

01-15-2015, 10:27 PM	#426
wibbly Veteran Member Join Date: Nov 2014 Location: Edmonton Posts: 600	You're pretty close. Ill list it officially when my next one shows up

01-16-2015, 07:02 AM	#427
Class A Pentaxian Join Date: Aug 2008 Location: Wellington, New Zealand Posts: 11,251	Originally posted by onebeachbumm Surly someone of your vast experience will help a fellow Pentaxian? Surely, you will find that extending sarcasm in general is not the most inviting approach for asking others to spend their leisure time to help you.

01-17-2015, 02:32 PM	#430
onebeachbumm New Member Join Date: Nov 2013 Posts: 19	Originally posted by Class A Surely, you will find that extending sarcasm in general is not the most inviting approach for asking others to spend their leisure time to help you. I guess they do things differently DOWN UNDER? ---------- Post added 01-17-15 at 04:34 PM ---------- Originally posted by 5shot I'll give you $50 for it Hell, I'll give you $50 for it just for the chance to play with it and see if it can be patched/hacked to work with the screw drive. ---------- Post added 01-17-15 at 04:47 PM ---------- Originally posted by LFLee continue from thread above! 5. Copy new lens config from memory card to EEPROM & test lens works in screwdrive mode a. On the penultimate page again, there should be another option "LENS ROM SD=>CAMERA" - basically does the opposite of step 3a and copies your new datafile back to the EEPROM inside the camera/lens. It will say "VERIFYING" and go through the rows in the LENSEEP file until it's happy. b. Press the menu key to exit the debug menu and check autofocus works and you can hear the screwdrive operating (easy to check with my lens as the SDM was dead - so activity meant success!) Note: if you haven't edited the file properly, you probably won't find this step working... in my case, I had followed instructions for the DA16-50 which only has 4 blocks rather than 8 to edit... I went back to my computer and made the other 16 edits and then it worked. So don't panic and take your time. comment: the "LENS ROM SD=>CAMERA" option is here: Attachment 250201 once you click "OK", the screen flash several message quickly (didn't manage to take picture, sorry). But I did see "VERIFYING : ...", and one of the message looks like this : Attachment 250204 Then the screen goes back to development menu. You are done! 6. Use PKTether to turn off Debug Mode a. Leaving your camera on, connect it via USB to the computer b. PKTether should show that the camera is now connected and the camera should show "PC-5" or similar message in the top LCD c. Choose "Camera Debug Mode Off" from the Debug mode menu Done! comment: this part is pretty easy, now enjoy the noisy screw drive, but working AF! accurate, and fast!* 7. Tidy up memory card by removing "boot files" As a final step, I deleted the "boot files" from the root directory of my memory card... I didn't want to leave them lying around just in case. Read more at: https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/208353-how-...#ixzz3MCAB3DhA Thank you for taking the time to list all the steps including photos... Just wish I had found this before three days of stumbling in the dark. But I have saved it for future reference. Again, many thanks! ---------- Post added 01-17-15 at 04:58 PM ---------- Originally posted by Arizona Dave I would like to thank all of the contributors to this awesome thread. I especially thank Driline and LFLee for the clear instructions in posts 274 and 386. Dave, is there any way to copy and save post #386?

01-17-2015, 04:50 PM	#431
wibbly Veteran Member Join Date: Nov 2014 Location: Edmonton Posts: 600	Onebeachbum, it does work with screw drive. that's not the problem. The issue is the lost focus cal data. So it will screw drive to incorrect focus

01-17-2015, 05:50 PM	#432
Arizona Dave Pentaxian Join Date: Jul 2011 Location: Phoenix, Arizona Posts: 440	Originally posted by onebeachbumm Dave, is there any way to copy and save post #386? Yes. Click on the settings tab of your browser, Select FILE, and SAVE AS. I saved the pages I wanted as HTML files to the same folder as the other files I made for this project. If this thread disappears, I'll still have good instructions.

01-19-2015, 12:27 PM	#434
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Darren M For the K10D, I made the MODSET.TXT file with the [OPEN_DEBUG_MENU] instruction and put that in the root directory of an SD card. That's already been documented a couple of times in this thread, though, Darren? Good to see you're going, anyway.

01-20-2015, 10:33 AM	#435
LFLee Veteran Member Join Date: Aug 2009 Location: Southern California Photos: Gallery \| Albums Posts: 2,292	Originally posted by Aggie89 I have tried multiple times to convert a 60-250 to screw drive using this method. I have never gotten it to work. Originally posted by leeak Neither could I. Only one person claimed to have done it, but no actual prove. I was obviously skeptical. The guy now told me that after some extensive testing with another guy, he said he didn't actually got the 60-250 to work... so as of now no one confirm this trick work on 60-250.