Fused silica telescope mirror blank, 12.5\" Dia. X 0.81\" thick. For Sale
![Fused silica telescope mirror blank, 12.5\](telescope-image-large/g/xcMAAOSwbkVaEe5b/s-l1600/Fused-silica-telescope-mirror-blank-12-5-Dia-X-0-8.jpg "Fused silica telescope mirror blank, 12.5\")
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Fused silica telescope mirror blank, 12.5\" Dia. X 0.81\" thick.:
$400.00
Both sides flat & polished, edged round, defect-free and ready to support your lightweight telescope project. Fused silica has a much lower coefficient of thermal expansion than Pyrex, rendering the all-important surface figure impervious to environmental temperature swings both when making the optic and under the sky when using it. Other sources charge 2X what I am asking; grab this piece at a 50% discount!
