Quality Control with lenses

Started May 21, 2013 | Discussions thread
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RStyga
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Quality Control with lenses
May 21, 2013

From personal experience, over the last several months, I had to return a number of lenses due to QC issues (either debris or coating defects); an indicative list follows:

Canon EF 85mm F1.8 (debris inside the lens)

Canon EF STM 40mm F2.8 (debris inside the lens)

Panasonic 14-42mm (debris inside the lens)

Sigma 30mm DN (debris inside the lens)

Sigma 70-200mm II F2.8 EX DG (coating damage, on two consecutive copies!)

Leica 14-50mm F2.8-3.5 (debris inside the lens)

What on earth is going on??

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