Originally posted by Stavri The switch between the screw-drive to Sdm was a problem with my Da 50-135mm, in my experience that's a sign of sdm failure. On the da 50-135mm the SDM needed "warming-up" before use, turning the manual focus ring back (quick-shift) and forth while pressing the AF button till the af kicked in.
But, when you turn the manual focus ring back and forth, it would actually engage the focus mechanism manually?
I was doing that but the focus meter window was locked at infinity still until the screwdrive kicked on...
So, even if I turned off AF altogether and decided to just use manual focus, the lens would be stuck.
This doesn't sound like normal SDM failure behavior.
Unless somehow the "confused" af motor pushed the focus mechanism past infinity causing it to get stuck? Is that even possible?
---------- Post added 03-10-17 at 12:06 PM ----------
Originally posted by Michaelina2 Unfortunately I think this goes beyond cleaning the contacts..
I'll cross my fingers though and hope for the best!
Though, the physical locking of my focus tells me otherwise.