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Home > Classifieds > Astromart Classifieds > Telescope Making > Classified #89916

For Sale: 4" blank, 4" negative lens

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4.25" glass blank. Full thickness cast blank, probably plate glass ( I can't see any Pyrex or other designations). $10+sh

4.5" Plano-concave lens -325mm fl. Has small chip extending about 1/8" in from edge. Use for short focus cassegrain project, or make one heck of a single element barlow! $10+sh

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