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GSO 12" F5 Parabolic Primary mirror (BK7) from Z12, Secondary Mirror Sold!

Price - $275.00

Ad Number: 180340

Posted: 14 Aug 2019

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SOLD, pending receipt of mailed payment from CN member.

For sale is a GSO 12" FL1500mm F5 parabolic primary mirror pulled from my Zhumell Z12 (aka Apertura AD12, SkyLine 12, etc). The Z12 secondary mirror (70mm, I believe?) and secondary spider are also available. Mirror cell is optionally available.

I was going to do a split tube truss dob ATM conversion on my Z12, but wound up coming across a good deal on a 12" ES ultralight last weekend that I just couldn't pass up... so I am parting out the Z12. This is a solid performing mirror that is typical of GSO's reliable optical quality found in their mirrors within the 8-12" range. I experienced consistently good, sharp planetary views at 275X using my 5.5mm with this. Performed excellently on DSOs under white zone light pollution. On clear, stable nights, this mirror can surely be pushed quite a bit more. No major aberrations when I star tested- no stig, no zones, no glaring TDE.

Brand new, the primary and secondary would be $580 from a retailer.

Mirror Specs & Health:
- Dia 304mm, 38mm thickness, FL 1500, f/5, BK7 glass, 14lbs, 92-93% reflectivity, aluminum coated with SiO2 overcoat.
- Great contrast, no astigmatism, no zoning, no glaring TDE.
- Coatings in excellent shape, no oxidization or coating failures (no pinholes, no scratches)
- Cleaned once in its life with distilled water; I will clean any stray dust off with a puffer and do a touchless distilled water rinse before packing, for safe shipment (unless you prefer it not be touched)
- Will be very carefully packed using acid free paper, cardboard, and styrofoam to eliminate movements, using the same careful packing techniques detailed by Lockwood optical
- 2 years old
- Stored Indoors
- Secondary is of similar like quality


- 12" Primary & Secondary, Mirrors Only- $275 + Shipping Cost

Pictures of mirrors safely packed and ready to go!


  • Condition Excellent, 2 years old
  • Location Long Beach, CA

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