wayne.robbins wrote in post #14782991
I had a problem once with my Canon 70-200 IS II. It would not focus- didn't even look like it was trying. I pulled it off- and put it back on- and the problem hasn't came back. I thought it was a fluke. That's never happened with my Sigma. Now I am starting to connect the dots- a lot of Canon's apparently have focusing issues.
Now, I see I should start a thread, and start collecting serial numbers of working and non-working 70-200 IS II's. Canon apparently has a reliability problem with that model and we should make a point of it and gather the info- and push Canon for a fix. Please don't include the last four digits of the serial number - for security reasons.
according to lensrental, the coveted 70-200 mk2 had a high rate of problems. The 17-55 was another one with high problems, but fixed with silent updates. If you're under warranty, send it to canon, I'm sure they have the fix.
Sony A7riii/A9 - FE 12-24/4 - FE 24-240 - SY 24/2.8 - FE 28/2 - FE 35/2.8 - FE 50/1.8 - FE 85/1.8 - EF 135/1.8 Art - F 600/5.6 - CZ 100-300 - Astro Rok 14/2.8 - Tamron 17-28/2.8 - 28-75/2.8 RXD, 70-200/2.8 VC