I've owned Caltars and Sinarons but I haven't tested them side by side. But regardless, I always treasured my beautiful Sinarons more than my crappy Caltars. And, given that they must do some sort of QC at the factory, it does make sense that Calumet would get the left side of the bell curve while the German manufacturers would get the right.
But I really think the biggest difference between the rebranded lenses is ~20% plus or minus in resale value.
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