how optical filters are made

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AgX

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I admit I was surprised to learn that each filter is polished seperately. I expected them to be cut from a polished plate. Though, that would necessitate quite some effort to keep the main surfaces unharmed during breaking and edge grinding.
 

E. von Hoegh

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AgX said:
I admit I was surprised to learn that each filter is polished seperately. I expected them to be cut from a polished plate. Though, that would necessitate quite some effort to keep the main surfaces unharmed during breaking and edge grinding.
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The thickness is critical, it's what determines the density of the finished filter. Also, it's probably more ecomonical to maintain plane/parallel surfaces when polishing individual filters on a block.
 
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