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Home > Classifieds > Astromart Classifieds > Telescope Making > Classified #171947

For Sale: Optical Glass Blanks for 4" Achromat(SOLD)

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I have for sale one 4.25" disk of BK7 and one 4.25" disk of F2 optical glass. These are flat on both sides and appropriate for a nice long-focus refractor. 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 = 1/2"+
Index of Refraction = 1.620
Dispersion = 36.4
Thickness = 1/2"+
These are fine annealed blanks and perfect for a first-class refractor.
I am asking $55.00. Buyer pays shipping. I do not accept Paypal.
Thanks for looking.

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