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- Eddy
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That's my thinking too. Why they would use a unique coating for just this type of lens isn't clear to me, but it does seem to be the most logical answer.
Good question.
I have 18 of these lenses.
3 with date code 93 => August 2012 ... 1 with this problem (April 2013)
1 with date code 95 => October 2012
1 with date code 96 => November 2012 ... 1 with this problem (December 2015)
2 with date code 01 => January 2013 ... 1 with this problem (May 2016)
3 with date code 04 => April 2013 ... 2 with this problem (June 2015, March 2016)
2 with date code 08 => August 2013
1 with date code 09 => September 2013
3 with date code 14 => February 2014
1 with date code 30 => June 2015
1 with date code 38 => February 2016
So it could be an issue with early examples of this lens which has subsequently been addressed, in which case our newer ones won't suffer from it.
Or it could be that it typically takes a few years for the coating to degrade, in which case our newer ones might suffer from it at some point.
Trouble is, we'll never get any kind of official acknowledgement from Canon that there is an issue.
Just checked my copy of the lens, date code UW0212, and it doesn't seem to exhibit any defect of the sort... Hope this helps in your investigation
[EDIT] Ooops, my lens is the MK I 24-70 f/2.8 - sorry!!
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