Re: Old (?) glass type FS-2

Are you sure your friend does not have a touch of dyslexia and he is really
talking about SF-2?

I do not know of any fused silica manufacturers that use FS-2 as a
designation for a grade of fused silica. I have seen in some papers where
people compare various grades of fused silica, they will arbitrarily call
one sample FS1 and the other FS2.

--
Adam Norton

Norton Engineered Optics
Optical design and systems engineering for Silicon Valley and beyond.
http://home.ix.netcom.com/~anorton/

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"Bob May" <bobmay@xxxxxxxxxxx> wrote in message
news:1113329124.513989@xxxxxxxxxxxxxxxxxxxxx
>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.
>
> --
> Why isn't there an Ozone Hole at the NORTH Pole?
>
>


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