Originally posted by fwwidall A big "thank you" from me for this great posting. My six year old DA*200's SDM failed this weekend, and I was easily able to convert it to screw drive with these instructions using my K5. The SDM had failed once before about a year after I purchased the lens and it was repaired under warranty at that time. Hopefully I can now get at least another six years of great
images form this lens. Thanks again, Fred.
You are very welcome! I am happy this has helped so many people. Thanks for letting us know!
---------- Post added 01-08-17 at 04:13 PM ----------
Originally posted by DavidDwight To anyone who has done this conversion: I've recently noticed some anomalies with two lenses I did this to and not sure if it is coincidental or cause. I have not gone back and changed it lens firmware back to the original file (which I saved) to see if the anomalies disappear (which would confirm it for me - thought I would ask before going to the effort). The anomalies? 1) camera not saving the fine focus adjustment calibration. I the the lens off, put another on and then switch back and it goes back to "none set" as if it doesn't recognize the lens. 2) the EXIF lens information is gone - going back a long way in my library it was clearly there but recently it is gone (but there for other lenses).
So could this change change how the camera recognizes the lens? It does not seem like a logical way to design the system but ...
I can't say I have these issues. It is my understanding we are only adjusting the lens rom that acknowledges the SDM motor is ready for use. I believe when this "check" happens, our adjustments bypass the "motor is present" or the check fails and by default, screw drive is used. I hate to point to the camera for these issues, but there could be an issue there OR perhaps there is additional issues with your lens other than the SDM and Rom mod.
I hate to hear you are having these issues. Please let us know the outcome.