Succeeded in filling the pop. Everything was very cold and so mixing by hand was difficult. The top (to become bottom) is not level. It rises above the edges...
Hello, Just joined the group tonight and glad to be here. I was wondering if there are any here who have test information on the 12 and 16 inch GSO mirrors?...
It flow was like cone ice cream, not thick milk. ... From: a To: atm_free@yahoogroups.com Sent: Friday, May 01, 2009 2:59 . Subject: [atm_free] pop success ...
Hi Steve, I haven't got any test info but a friend of mine bought a 16" GSO mirror and it performs very well indeed. Judging from the star test I would say...
Welcome to the group Steve. Ali ... From: Dnepr To: atm_free@yahoogroups.com Sent: Friday, May 01, 2009 10:44 a Subject: [atm_free] Looking for mirror quality...
Welcome to the group Steve. Ali ... From: Dnepr To: atm_free@yahoogroups.com Sent: Friday, May 01, 2009 10:44 a Subject: [atm_free] Looking for mirror quality...
That is about right. Some atm's recommend a more fluid consistancy, but the products are designed to be thick. You can quickly flatten the back by grinding it...
I have had one 12 inch GSO on the bench that I tested. Overall the surface error was figured to 1/8 wave, but the surface was rough. The owner of the mirror...
Robert/ et al, I got a reply to an inquiry I sent to GSO about the quality of their mirrors. Below is the text of what they sent me. He attached 2 photos of...
Also, I made an error in naming one of the scopes below - it is Astro-Tech, not AstroCat. ... -- "Where the people fear the government, you have tyranny; where...
1/2 wave isn't acceptable, even 1/4 isn't anything to get excited about. Also they don't say if it's surface or wavefront error, it makes a difference. Tony ...
Is surface error a bigger bad news than wavefront error? ... From: Tony Gondola To: atm_free@yahoogroups.com Sent: Saturday, May 02, 2009 10:00 a Subject: Re:...
For a mirror, a surface defect is doubled in the wavefront. So a 1/4 wave surface error would correspond to a 1/2 wave wavefront error. There are many...
The ads for the Astro-Tech RC's are inconsistent. I don't know whether that's a distributor oversight or not. I have seen the claim of "1/12 wave or better...
See files dale eason \ hubble12.5.jpg This is my interferometer analysis of a Hubble 12.5 mirror. A real foucault image is on the right and the surface error...
Hi, nice to see a group that is active and not totally spam. my question is how heavy of a spring should I use on a 8" mirror cell? wire spring or standard...
While pop base is drying out, I restarted the six inch project. After cordal I went to coc but fl increased a lot so back to cordal for a while. Also, for 10...
A large bevel has left the outer 3mm useless. Outer 1 inch of mirror and tool are in contact, not the central 4 inches. How to spread the contact region? ...
Here's what you are supposed to do: Grind (MOT) using the chordal stroke until you have reached the desired sagitta for your focal ratio goal. Do not worry...
Thanks a lot Mark. My 45 degree bevel has eaten up 3 mm of radius. Ali ... From: Mark Whitaker To: atm_free@yahoogroups.com Sent: Sunday, May 03, 2009 9:19 . ...
Thanks Mark. My mirror is 15mm thick and the tool is 8mm thick disk of plate glass. ... From: Mark Whitaker To: atm_free@yahoogroups.com Sent: Sunday, May 03,...
Well, we tested my Hubble-Optics 14" mirror yesterday. I was pleasantly surprised to the max! We do not have an interferometer, but our club has a very nice...
Well, two points (assuming that's 1" thick plate f/5), or two points (if it's a 2" sandwich f/5 at effective 1.2" thickness): 5 zones isn't optimal for a 14"...
Mark, Yes, you are totally correct about the 7 zones. It was an oversight, and I had driven 2 hours one way to get there and had a time definite to be home....
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