An exceptionally informative article by Dave Etchells at Imaging Resource, who has just posted a story about his visit to Sigma's factory in Aizu, Japan!
He follows the process from shaping the lens surfaces, to polishing, assembly and testing. It is really rare that a manufacturer let's a journalist to visit factories AND shoot photos there.
Click here for the full article on Sigma lens factory visit!
Click here for the full article on Sigma lens factory visit!
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