How neutral density filters and optical filters are made?

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Pmapeso
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Joined: Thu Sep 15, 2022 10:47 am
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How neutral density filters and optical filters are made?

Post by Pmapeso »

I am wondering if anyone know the composition of oxides in a standard neutral density filter or other optical filter?

This project is for IB Internal Asesement and a personal project.
I have read the they are composed of cobalt oxide + another oxide for a desired percentage of light block.
I understand that CoO is extremely toxic. Is there an alternative I can use?
I would like to make a ND coating similar to hydro-dipping that would allow a user to coat their own lenses, glass etc.
I have hypersensitivity, and I want to develop this to help not only myself but others with this issue.

Thanks,
Phoenix Mapeso
ctactawong
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Joined: Thu Apr 30, 2020 7:56 am
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Re: How neutral density filters and optical filters are made?

Post by ctactawong »

Hi Phoenix,

Optical coating requires special equipment and is pretty challenging to DYI. To my knowledge, glass cannot be tainted unless with dip coating unless there's a taintable coating on top. Sorry not much of a help in this response.
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