... I did not "rejected" all US makers. First I wanted a COMPLETE SYSTEM, not parts. Second, if possible, I did not like to wait a year. Third: do you have an...
... Unfortunately If you have to send a mirror back, across the ocean (and customs), that is a pain. But, besides this, the "buy relaxed and if you find you...
... Sorry, when I wrote a zone, I intended two steps (down and then back up, ie a dip). Besides this the basic idea is to compare the ptv, rms, and strehl of...
... high order aberration to roughness) that have a great impact on final pèerformance. Li= ke to say that two mirrors that have the same "spirit" of which...
Mauro: <In other words the interferometric certificate is based on the fitting <surface and is unable to distinguish between mirrors having many versus <little...
... [not that there's anything wrong with that] g. ... <steve_koehler@s...> ... Zernike terms ... radius) ... radius) ... coded as ... square ... sides of the ...
... James, I am very happy to hear you say that. I had been thinking how interesting this thread was and wondering if making mirrors professionally took the...
Hi guys, I think we may be converging on a sort of consensus about mirror measurements. Regardless of which manufacturer we are talking about, at least one...
Steve, You sent me a message off list and I managed somehow to delete it before I could answer it. When you get a chance, please contact me again. futtrich...
I think that this discussion is getting out of hand. It is obvious Mauro has a continuing problem with Torus. That is his perogative, however flaming them at...
futtrich (Myron) wrote ... and Strehl. ... Used in this way, the mathematical expression is taken to be a COMPLETE description of the mirror. RMS and Strehl...
... The point is (but this is phylosophy :-) that you (but it is true also fo the others, with due adjustements) "quantify" the errors on a copy (the fitted...
... I also think this discussion is getting a little too long. However it is not true I have some problems with Torus: I do not own a Torus and James never did...
Myron, You have been able to clearly summarize every point. Compliments. My only note is that there exist no "qualitative measurement". Measurement are only ...
Frédéric Congratulations. What a good looking 'scope incorporating some leading edge stuff. I have an old 600mm, f/3.5 mirror sitting in my garage waiting...
But again about real life performance (please do not mention Xxxxx in this thread, otherwise people say I have something against it). Here is a link to Jon...
Hello, i would like to point out that real viewing experience under the sky implies other elements into the equation, elements that i have not seen mentioned...
Mauro: I think we've reached a consensus on the value/uncertainty of quantifying the shape of a wavefront. The tests used to quantify the wavefront ...
Myron: I think you have summarized the discussion on this topic to date very well. I agree with everything you say. Quantifying, or at least estimating the...
Hi Guys, I've been reading the mail so to speak for a few weeks and have found the many discussions informative and interesting, for the most part 8-) I would...
... So what is the point? Are you meaning that investigating the main mirror is unnecesary (or that more or less they are all equivalent) because there are so...
... Well... You forget the seduction of the "high tech side": people is prone to think that a interferometric test report is "true" by definition. On the...
... OK but the point is what sense have making even accurate measurements on something we do not exactly know how accurately represents the real thing? I would...
So what is the point? Are you meaning that investigating the main mirror is unnecesary (or that more or less they are all equivalent) because there are so many...
Bilar, A reflectors optics and collimation are put to the test at high power. With your fast f/4.7 collimation needs to as near perfect as you can get it. If...
Hi Mauro, In preparation for learning to use the Foucault test, I have downloaded several Foucault analysis programs including Figure, TEX, and Six-Tests. I...
Neil is right that collimation is VERY important on fast mirrors. Any mirror less than f/5 is considered fast. For us to help, we need to know what you see...
