Re: Old (?) glass type FS-2

I realize that without the melt data, any optical glass data is only an
approximation. However, even just knowing the approximate values can be
useful in making a lower quality refractor telescope as you can always build
the scope and test it and then correct any bad errors if found.
My suspicions are that it is a Fused Silica type but that can be way off.

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Why isn't there an Ozone Hole at the NORTH Pole?


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