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Home > Classifieds > Astromart Classifieds > Telescope Making > Classified #179686

For Sale: Nice Optical Glass Sets For 4" Achromats

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I have for sale one 4.125" disk of BK7 and one 4.125" disk of F2 or FN11 optical glass. The BK7 is flat on both sides; the F glass is slumped about 1/4" on one side. These are appropriate for a nice long-focus refractor. Some blanks may have small edge chips but these will either disappear in grinding or not be in the light path of the lens. I have chosen these carefully to make sure this is the case. I can provide a raytracing sheet with correct radii of curvature you can aim for to produce a nice scope. Here are the specs of the glass:
Index of Refraction = 1.517
Dispersion = 64.2
Thickness = 3/8"+
F2 or FN11
Index of Refraction = 1.620
Dispersion = 36.2
Thickness = 13/16"+
These are fine annealed blanks and perfect for a first-class refractor. The numbers on this glass are consistent with both F2 and FN11 glass. Both of these are "preferred" glasses for lenses according to Schott Technologies.
I am asking $45.00. Buyer pays shipping. I do not accept Paypal.
Thanks for looking.

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