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12.5" f/8 Pyrex Primary Mirror - UNFINISHED Sold!

Price - $190.00

Ad Number: 148482

Posted: 16 Sep 2018

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Perfect for a planet killer or Chief! This mirror has been partially polished out at a focal ratio of approximately f/8. Full-thickness Pyrex (2.25" edge thickness) weighing about 21 lbs. There is a small edge chip that doesn't affect the aperture in the middle of the side of the blank, and a small, odd-looking clamshell fracture which at worst removes about 0.5 square inches of aperture (assuming it even needs masking at all).

I was hoping this would be a shorter focal length so I could use it for a scope project, but an f/8 is too long for me and I can't bear regrinding it to a different focal ratio (although maybe you can).

$190 + PayPal + shipping.


  • Condition Minor cosmetic-only chips
  • Location Connecticut

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