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NEWS ニュース
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How to cut straight edges in a round element
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Flattening optical element’s surface manually
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Cleaning optical elements according to their inherent material properties
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A make-or-break attitude in every batch of lenses we make
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Selecting and preparing polishing pads
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Interference rings projected by test plate glasses
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Precisely arranging diamond pellets
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Grinding skill that determines the identity of an optical element
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Bringing back the slotted-head screw
![](https://www.cosina.co.jp/wp/wp-content/uploads/2021/10/reasons-cosina-choices.png)
Diaphragm blade design and assembly
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