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Repair/Adjust/Clean Canon 17-55mm f/2.8 - Dropped and Slipping focus
Thank you for this write up. Very detailed and helpful. I attempted to rotate the silver retaining ring back in and now the manual focus is beautifully engaged. However, I now encountered another problem. Auto focus is now behaving in a very strange way. It is less responsive and a bit choppy at times and I have to press the shutter several times to make it worked. I am not sure if insufficient or excessive pressure is the problem.I dismantled the lens again and rotated the silver ring a bit backward and it has improved a bit but still not like before. I hesitated to open up the lens a third time. I worried about breaking the flat cables.Before I go further, is there any info regarding how to adjust the pressure of the USM to make the AF working again.Thanks.
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