70-200, 2.8. Mk2, not focusing at 200mm

dba101

EOS M6 Mark II
Sep 11, 2018
74
88
My 70-200 2.8 mk2 is not focusing at 200mm. If I zoom out to maybe 160-170ish it’s fine. Any ideas?
 

Czardoom

EOS RP
Jan 27, 2020
359
770
Is this a new lens that has always had this issue, or did this lens used to focus at 200mm, but now has developed this issue?
 
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dba101

EOS M6 Mark II
Sep 11, 2018
74
88
Is this a new lens that has always had this issue, or did this lens used to focus at 200mm, but now has developed this issue?
Hi, Thanks very much for the reply. it’s definitely developed this issue in the past few months.
 

Monte

EOS 1DX-mkIII
CR Pro
Jul 7, 2013
65
41
ALBERTA, CANADA
My uneducated thoughts are that there’s maybe a ribbon wire unit internally maybe that moves/rolls along while zooming to different points and when moved to the 200mm end, it’s revealing a broken wire in the ribbon or at its connection point. Maybe.
 
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Mt Spokane Photography

I post too Much on Here!!
CR Pro
Mar 25, 2011
16,718
1,689
It needs to go to Canon. They usually have fixed repair costs in 2 or 3 categories, I'd hope this is the low end repair. Most of the cost comes from the labor to tear down, reassemble, and test or calibrate if that is thrown off by the parts replaced. I'd send it in sooner, its always possible that it could develop into a more serious repair.
 

dba101

EOS M6 Mark II
Sep 11, 2018
74
88
Thankyou both, for your time and thoughts.
Canon have said it should be the ribbon or at worst the diaphragm. Great to hear ‘send it in sooner’ I definitely will now, and post the result. I would like to part trade-in for the RF version, so it needs to be done. Fingers crossed.
Its been amazing though, I must admit.
Thanks again.