do you have images or diagram or picture of Pfund like hte ADA-compliant McDonald Observatory I try to find any nothing google as his limit jack 47'N 71'W...
Try this, scroll down to my 16". http://www.dustymars.net/IsoObservatory.htm ... for ... mechanical design ... members on ... main ... dampening ... Pyrex...
I guess I'd back up and ask: why Newtonian? A DK Cass of around say F/20 to 24 would be fairly easy to construct optically and would make a much smaller ...
I do not know exactly waht is a ( DK Cass ) probaly a kind of casgrain but and off axis could be also good choise at F=20 jack 47'n 71'W ... to ... smaller ...
....I'd also add why F/9? You're still going to need a barlow to get to the right amount of over-sampling and you don't need the large coma free field. If you...
Hi All, What I'm looking for is the part on the driven side of a Meade ETX-90 EC OTA's fork arm (RA?Dec?) drive. This part links the tube to the fork on (as I...
Hi Tony - this comments intrigues me "Again, and I think Suiter talks about this, it's the concept of overhead. If the first diffraction ring is too bright it...
Peter, My personal experience has taught me that the ability of the mirror to cool is one of the most important variables. No matter how much you try to...
Greetings, A rookie question. The placement of the focuser should be where? I THINK the answer is : The focal point (the tiny pinprick of light) should be 1/2...
Hi All, Ok, this is somewhat off topic and a huge cross posting to boot, but as I'm planning my holidays for next year (I'm in Australia) and I would like to ...
Your getting no response because there isn't a simple answer to the question - much depends on what you want to do. But assuming your white spot is at the...
Peter, At F/9 one thing you could do to improve the image contrast is to make it unobstructed. You could turn it into a CHief as I did a 12.5 inch. Check out...
I have acquired several pieces of glass over the years that I will probably never get around to using. Most of these are refractor lenses or blanks of various...
Hello, At Stellafane ('08) we had a chance to spend some time with Ed and his 12" CHief. Mostly on Jupiter, and even though it was low and conditions weren't...
... wrote: Hi Ken, Would you please send me your Personal E/mail Address I need to inquire as to some small pieces of glass, to finish up some small scope's. ...
You should have also the primary mounted in the middle of the collumation travel so that you can,if needs arise adjust the distance from primary to secondary...
Hi Ken; Please contact me offline. I would like to get some of your glass. Thank You Gordon Berry ... them ... disks ... diameter. ... lens ... to ... is ... ...
I need to find someone who knows how to model non-standard situations into PLOP. Specifically I'm looking to model the performance of a standard flat blank...
Hello Group: I have two lens elements I need to cement together. I have a small bottle of Norland Optical Adhesive 61 which is UV-light curable. Both lens...
... I think he is referring to the underlying tool for: http://www.atmsite.org/contrib/Holm/Plop_optimized_cells/index.html used to design cells for Newtonian...
Yes, that's right...... Tony ... From: "Richard F.L.R. Snashall" <rflrs@...> To: <atm_free@yahoogroups.com> Sent: Tuesday, August 19, 2008 11:36 AM ...
Hi, I just received my figured 10" mirror back from Tony Gondola, BigEye Optics. The mirror looks beautiful, what a supurb job figuring it. After making a 10"...
I would just like to echo this rating for Tony. He did an 8" f/6 for me that is just nothing short of phenomenal. He re-figured my orion 8" mirror - here are...
... RP, I am curious about your impression of the change in mirror performance. The original mirror would appear to be diffraction limited from the numbers...
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