Roger just looked at this. Somewhat less variability than WA's, but not that
much different. Little relationship to price or year of release which is a bit
odd.
Complex more recent lenses may be even more difficult to keep the QA even the
same though. Zeiss and the recent Canyons seem to do reasonably well.
http://www.lensrentals.com/blog/2015/07/variation-measurements-for-telephoto-lenses
Mike
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