10-08-2018 10:46 AM
Solved! Go to Solution.
10-08-2018 11:21 AM
It is a focus by wire system, so it appears that something is broken inside.
Sometimes it seems that it takes a while to wake up the focus system, in other words, it might take a few turns to get any movement at all. Did you try that?
Are you trying when the camera is in focus/exposure mode just after you half press the shutter button?
10-08-2018 11:26 AM
10-12-2018 09:10 AM
If it is only a few months old, call Canon and send it back. It appears that the encoder is broken.
Like the OP, I thought that only STM lenses were focus-by-wire in manual mode. Is that not the case?
10-12-2018 09:22 AM
09-24-2020 02:08 PM
I had the same problem with my 18-135 IS STM. The lens acted like it was still in AF when I switched the button from AF to M. I changed AF methods in the menu from FlexiZone to Quick Mode, and the problem went away. Oddly, when I then switched back to FlexiZone the lens continued to work in both manual and auto focus.