A question about objective testing of eyepieces came up on a C14 group tonight. The thought occurred to me that if you used an eyepiece in reverse the way...
Tanveer, Very nice test! What camera did you use -- just wondering what the pixel size is. Your comments about astigmatism are interesting -- I presume the...
Thanks, Jon. But first let me thank you for putting together the cookbook. That and the advice from another group member to use IRIS to create the FITS files...
Hi All, I've uploaded all files from my MN-66 run. The RMS is consistent with the previous run but the PTV is showing as 1/8 in the second run. This could...
Tanveer, looking at your second run are you using two of the same images (the intra one) in Roddier? The two images shown in your screenshot are the same....
I have uploaded an Anglicised version of Roddier 2.2 to the files section. Most of the user interface has been done, but some elements revert to French when...
Mark, Excellent! Many thanks!! I will try to look at it soon and see if I have any comments. - John B. ... to me. ... 20Roddier/WinRoddier2.2-eng.zip...
Hi Mark, I gave it a quick try. Seems very nice! Wonderful!!! A few small suggestions.... On the "Test Parameters" page, I think "Ray disk intra" should be...
My French is hopeless, so any suggestions are welcome :-) I have left all error messages in French - to aid diagnostics with the author. Mark 2008/9/12...
Hi all, I would like to post a question on the roddier test results with respect to collimation. Is there any way of measuring the "quality" of the collimation...
Depending on the telescope design, miscollimation usually manifests as an off-axis aberration. For scopes like a plain Newtonian or an SCT, it's coma. You can...
Hello Tanveer, Thanks for your feedback, I will check on these parameters to see what happens! On the item of Metaguide, yes it works wonderful, also the...
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Hi group I ran a Roddier test on my C14 last night and you can find a screenshot of the results for green light on the link below. I ran my first test a few...
Mark, You results now look great. I think Strehl above 0.9 for a mass produced SCT is cause for happiness. How exactly did you center your corrector? Did your...
Tanveer Yes my corrector has adjustment screws, I centred the secondary housing (secondary mirror removed) it its own reflection from the primary and the base...
Interesting. I've had my C11 apart a few times and did wonder about the amount of tolerance between corrector, tube and secondary holder. Move all of these the...
Mark, Very nice work! Do you think the corrector re-centering helped the astigmatism? Did you also somehow adjust the centering of the secondary mirror on ...
John Comments in-line... ... A pleasing result, but it is only one data point, I want to make a series of tests and try different blur circle diameters to see...
Group - I have uploaded to the Files section (folder Celestron C6R Star Test, file Roddier Test Results Comparison.pdf) a table showing the numerical...
Group - anyone have a link to a site where I could download Roddier v.1.0 and/or Roddier v.1.5? I am still studying results differences between versions and...
Group - I have posted to the Files section (folder Test Results Comparison) a revised version of the original test results table (see post #572)and a new...
Group - I have uploaded test results from some additional image pairs run through three different versions of Roddier software: Beta 0.4 WinRoddier2.0 ...
Mick, I read with interest your results and want to recognize the effort you put into it. Here are my observations: The images you submitted have a lot of...
... Mr. Jolly - thanks much for having a look at the test images and study results. Sorry to say, I don't have any good way to examine image statistics myself...
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