morls
01-10-2011, 10:19 PM
Hi,
Due to time and work commitments I have to defer my first ATM project, and so I have a 300mm GSO f5 mirror for sale. This mirror has been re-coated by Isaac Qin and tested by Mark Suchting. The results were:
Spherical Aberration judged to be better than 1/8 wave P-V at 550 nm;
Some primary astigmatism at 1/8 wave, probably not visible except for night of exceptional seeing;
Some moderate surface rippling typical of mass-produced optics;
Results indicate a mirror in the top of the range that could be expected for a mass produced mirror.
Bintel and Andrews sell these mirrors for $650. I'm asking $500.
It's been recoated;
It's been tested, so it's quality and optical characteristics are known;
For a mass-produced mirror, it's very good. There can be inconsistencies with mass-produced optics, but this has tested as a good mirror.
It's never been out of the box except for re-coating and testing. It's in the box, protected. I have receipts from Isaac Qin and a written report from Mark Suchting that I will pack with the mirror.
I'm not sure about shipping, so at this stage pickup in Randwick NSW is the best option.
Thanks for reading this ad.
Stephen
Due to time and work commitments I have to defer my first ATM project, and so I have a 300mm GSO f5 mirror for sale. This mirror has been re-coated by Isaac Qin and tested by Mark Suchting. The results were:
Spherical Aberration judged to be better than 1/8 wave P-V at 550 nm;
Some primary astigmatism at 1/8 wave, probably not visible except for night of exceptional seeing;
Some moderate surface rippling typical of mass-produced optics;
Results indicate a mirror in the top of the range that could be expected for a mass produced mirror.
Bintel and Andrews sell these mirrors for $650. I'm asking $500.
It's been recoated;
It's been tested, so it's quality and optical characteristics are known;
For a mass-produced mirror, it's very good. There can be inconsistencies with mass-produced optics, but this has tested as a good mirror.
It's never been out of the box except for re-coating and testing. It's in the box, protected. I have receipts from Isaac Qin and a written report from Mark Suchting that I will pack with the mirror.
I'm not sure about shipping, so at this stage pickup in Randwick NSW is the best option.
Thanks for reading this ad.
Stephen