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GSO 63mm Elliptical Secondary Mirror AD047 for 10" GSO dobs Sold!

Price - $49.00

Ad Number: 103952

Posted: 22 Apr 2017

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Offered here is a GSO AD047 63mm Elliptical Secondary Mirror. It is also known as 62.5mm and 2.47". This is the size of secondary used in GSO 10" dobs, from Zhumell, Apertura, Orion Skyline, Hardin Optical, and others. As you may know, the normal high-end aftermarket flat makers do not make flats this size.

I bought and used it for a couple months while my original secondary, which tested poorly, was being reworked. I was pleasantly surprised by the quality compared to the original. You can see the fringe test in the photos. It was a night-and-day improvement over the original. If you have a 10" GSO dob and suspect the secondary is "substandard", this will be a significant improvement. All of your eyepieces will benefit from it. And coma corrector, too, if you use one.

This is a known-good secondary, you don't have to roll the dice and wonder if you'll get a good one or not. It is in excellent condition and comes in the original packing.

Price includes 1st class mail shipping in the ConUS. No added fees for Paypal.


  • Condition Like new
  • Location sunny New Mexico

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