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chez wrote:
I'm not doubting there is copy variation...but with high end glass I'd expect none. The manufactures just got us conditioned to expect it to their advantage and our loss.
There are several variables.
Usually the manufacturing includes a quality check and determines whether the lens is inside the margin of error. If so, there is still copy to copy variation, but only within this band of variance.
The question is how many lenses are checked for copy to copy variation and to what extent (automatically, inspection by an engineer, etc.). That's not possible for volume lenses, but Otus, Leica, 400/2.8, 600/4 type of lenses and maybe for this one, too, more checks should be in order and are likely.
However, there is still the possibility of tranportation issues. If I compare the lenses send to me by a good photo store and amazon, there is a clear difference in packaging. Take the Zeiss foam packaging and compare it to the one found for Samyang in addition and I bet there are still, albeit rare, some outliers possible.
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