I have a 12.5" Telekit with a Pegasus full thickness astrosital mirror and am thinking of adding a second mirror to blow on the face of the mirror. Wondering...
Dave, I have a fan blowing at an angle of about 45 degrees, from one corner of the mirror box above the mirror. It seems to help a lot. I built a bracket out...
What ever happened to your quest for a 1 meter mirror? Corning Glass could make you one as well as GE. The folks who built the 100 incher are still in...
A recent off the cuff quote on a 45" was in the $100K range... I suspect these companies would be in the same range if not higher.... my thought is to get 8 -...
Have you considered to buy a big telescope from a professional observatory? IIRC there may be a dutch telescope in La Palma for sale? Roger Persson ... 50" ......
Exactly your goal was accomplished more than 15 years ago in Southern California. A group built a 48 inch RC on a fork mount in a two- story roll-off roof...
Yes I believe I am aware of this group - they bought a HiSIS22 CCD camera from my company (RXDesign - US Distributor for the LE2IM camera line) about 10 years...
... i think the most realistic plan of attack would be to get the 48" cellular blank from rockenberger: http://tinyurl.com/5vkqu then get united or newport to...
Looked at it - do not want another pyrex mirror. If I am going to invest into something of this magnitude it HAS to be such that it can be much more readily...
Making a thicker mirror as a plain disk will mean you will have to refridgerate it in the daytime heat. The glass will perform like a very good insulator....
This may or may not have been discussed before, I do not know. I have a question for some of you that have much more experience then me. I have a Meade...
The 4" is grossly oversized. Meade designed this scope (more specifically, some early GEM mounted version of it) back when dinosaurs roamed the earth and...
sorry - did not mean to imply the "webbing" was the issue... indeed if I were to spec it out it would be say a 48", 5" thick cored mirror. Then because the...
Paul, I wouldn't assume a 4" secondary is too large, but if you can determine where the focal plane should be, relative to the end of the focuser when racked...
You still have boundary layer ... that would be my concern; with a full thickness even if were made of zerodur, the the stored heat rising from the thick glass...
Hi Bill, I threw out a few emails and received two replies, Vaughn Parsons had a (quote)36" F/4.5 - 6" Thickness Pyrex - Lightweighted mirror ~200lbs with/ 7"...
nope... still disagree... the boundary layer problem is much easier to solve as all your doing is reducing its thickness - this is accomplished by blowing...
... If the observatory has power, why not cool the observatory - roof, dome, walls, concrete, scope, mirror, etc - all day to meet expected night time temps?...
... Can't really agree with this... the Arizona Mirror lab uses old fashion pyrex for the 8-meter and smaller mirrors it makes. The Keck scopes are also...
Still have heat build up in the concrete floor and the walls. If you cool the entire structure there won't be a boundry layer to deal with (in theory), or at...
... Why else would ALL the pro's ... gary, i think the problem of the boundary layer is even a more difficult problem b/c of the larger surface area of the...
Your points are well stated. I was not aware that the pro's were still using pyrex. I assumed, obviously incorrectly, they were not. Interesting. I do know I...
... Vid, the pros are back to pyrex because they now have adaptive optics which corrects not only seeing but also any mirror deformation effects. As long as...
Hi folks, I have a couple of questions about the Kendrick barlowed laser. I own an 11 inch f / 4.3 truss Newtonian and I've always had one small problem with...
... If you'd asked me ;-), I'd have said the powermate, despite its magnification, won't spread out the beam much at all, and nowhere as much as a regular...
My understanding from a working with some pros a few years ago, is that cost is a big factor combined ease of active cooling both the structures and the...
... one cloudy day when you are looking for a project, borrow a dry ice fog mach from your local bar and see how evenly you can adjust your fans to push the...
