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chongli
on Aug 5, 2019
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Disassembling the Sony FE 135mm F/1.8 GM
It's pretty hard to make a vacuum with moving parts included in the wall of the chamber. The better your vacuum seal, the harder it'll be to move the lens elements and vice versa.
And if the seal fails then you'll get a lot of dust inside.
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And if the seal fails then you'll get a lot of dust inside.