http://tech.groups.yahoo.com/group/roddier/ Roddier Test Wed, 16 Sep 2009 01:14:00 GMT m_hollimon http://tech.groups.yahoo.com/group/roddier/message/683 http://tech.groups.yahoo.com/group/roddier/message/683 Group - in post #680 I raised two questions about the interaction between camera sensor chip orientation and Roddier analysis results. I have so far found no Tue, 01 Sep 2009 20:08:42 GMT m_hollimon http://tech.groups.yahoo.com/group/roddier/message/682 http://tech.groups.yahoo.com/group/roddier/message/682 ... Oscar - an interesting point. Seems like this effect would also modify results for refractors but they generally test closer to expectations. Curious. I Tue, 01 Sep 2009 15:08:33 GMT Oscar González Regueira http://tech.groups.yahoo.com/group/roddier/message/681 http://tech.groups.yahoo.com/group/roddier/message/681 Only a point. I used Vega last year for Roddier test of a Klevstov-Cassegrain (TAL 250K). In my conclusion, it's too bright for a correct testing (I also Tue, 21 Jul 2009 20:12:57 GMT m_hollimon http://tech.groups.yahoo.com/group/roddier/message/680 http://tech.groups.yahoo.com/group/roddier/message/680 ... The above mods have been completed and a set of Roddier images (Test 9) obtained and analyzed using Vega as the target star. ... A "fanatically careful" Sat, 13 Jun 2009 16:42:54 GMT m_hollimon http://tech.groups.yahoo.com/group/roddier/message/679 http://tech.groups.yahoo.com/group/roddier/message/679 ... Dr. Biretta - sorry for any confusion about some of these details. All the Zernike coefficients displayed by OpenFringe are normalized,i.e., an error Fri, 12 Jun 2009 22:28:42 GMT zeissnut http://tech.groups.yahoo.com/group/roddier/message/678 http://tech.groups.yahoo.com/group/roddier/message/678 Hi Mick, I'm trying to follow along the numbers in these recent posts. Couple random questions.... So you are doing interferometry at the radius of curvature, Fri, 12 Jun 2009 03:54:21 GMT m_hollimon http://tech.groups.yahoo.com/group/roddier/message/677 http://tech.groups.yahoo.com/group/roddier/message/677 Dr. Biretta/Group - A careful further examination of the data in the comparison table of post # 673, plus some investigation into how the performance numbers Thu, 11 Jun 2009 01:14:27 GMT m_hollimon http://tech.groups.yahoo.com/group/roddier/message/676 http://tech.groups.yahoo.com/group/roddier/message/676 ... Dr. Biretta - thanks, I understand. Peculiar that I get a 0.02-0.04 Strehl improvement by turning them off; the mirror shouldn't have much roughness Wed, 10 Jun 2009 23:55:53 GMT zeissnut http://tech.groups.yahoo.com/group/roddier/message/675 http://tech.groups.yahoo.com/group/roddier/message/675 ... These are the higher-order aberrations or residuals after the other listed Zernikes are subtracted off. It will contain narrow zones, edge effects, bumps, Wed, 10 Jun 2009 23:33:38 GMT m_hollimon http://tech.groups.yahoo.com/group/roddier/message/674 http://tech.groups.yahoo.com/group/roddier/message/674 Dr. Biretta - in all the blather of post #673 I completely forgot to ask an important question: In the table of Zernike coefficients from Roddier, the bottom Wed, 10 Jun 2009 22:51:45 GMT m_hollimon http://tech.groups.yahoo.com/group/roddier/message/673 http://tech.groups.yahoo.com/group/roddier/message/673 ... Dr. Biretta - thanks again for the quick look. Armed with improved insights (as a result of your quick look at T6/0DegA), I reexamined said image pair Wed, 10 Jun 2009 19:04:56 GMT zeissnut http://tech.groups.yahoo.com/group/roddier/message/672 http://tech.groups.yahoo.com/group/roddier/message/672 Hi Mick, ... I had just looked at the first of the T6 results you had. If I isolate the spherical term, using the check boxes in Roddier 0.4 / Front d'onde / Wed, 10 Jun 2009 01:27:44 GMT m_hollimon http://tech.groups.yahoo.com/group/roddier/message/671 http://tech.groups.yahoo.com/group/roddier/message/671 ... Dr. Biretta - thanks much for the examination of some of the previous test results. I am going to carefully re-examine the later test stuff (T6, T7, T8) Wed, 10 Jun 2009 00:09:38 GMT zeissnut http://tech.groups.yahoo.com/group/roddier/message/670 http://tech.groups.yahoo.com/group/roddier/message/670 ... Hi Mick, I tried to get a quick look at your earlier results on SA. One interesting item I noticed is that Roddier and your interferometry seem to roughly Tue, 09 Jun 2009 18:03:31 GMT m_hollimon http://tech.groups.yahoo.com/group/roddier/message/669 http://tech.groups.yahoo.com/group/roddier/message/669 ... Mr. Leuba - thanks much for the encouragement. The impetus in all this is not to attack or demean Roddier but to try to get Roddier and interferometry to