Hi Mert, Our application is to revisit the optical quality for our telescopes at Palomar. The 200 inch sometimes has surface errors that become noticeable...
Hi Dan, I remember measuring PSF sizes on the P200 couple decades ago for some similar effort. Glad to see folks are still interested. - John B. ... method...
Hi Dan, Thanks a lot for the time you took to write up such an interesting explication for an amateur like me! It has always been a dream when I was a child to...
On one of the other astro groups the statement was made that Roddier analysis requires 16-bit FITS files to run, and that it will not see any other resolution....
Hi Mick, ... Roddier will only read 16 bit FITS files. However, it is relatively easy to convert whatever format you have to 16 bit FITS. Many imaging...
... John - thanks greatly for the info on Roddier; it all gives me some hope. I habitually use the DFK camera with an uncompressed codec; I will be sure that...
... John - to clarify the above comment about Registax: if I take intra-focus and extra-focus AVIs (say using my DFK 21AF04.AS camera and TIS software IC...
Hi Mick, ... 21AF04.AS ... then ... cookbook ... Tools)? ... I have not yet succeeded in taking the Registax output format directly into Roddier without some...
... John - thanks much for the very prompt reply. I also will see if I can get an output from IC Capture that Roddier can digest. If not, I may have to...
Group - I have completed a series of Roddier tests on my C6R and have posted some data files, results, and discussion to the Files section in the folder...
Mick, Thanks for posting your results. So far I just had a very quick look at them. Here's a first pass at your questions. Perhaps others will add from...
... Mr. Biretta - thanks much for the "quick" response and answers to my questions; seems pretty well thought out to me. If you get a chance to look a little...
Hi guys, I just uploaded tifs for extra/intra focus for my C9.25 in the files dir. They are tifs stacked with registax using a toucam. The seeing wasn't that...
All right then! Good news, your scope is diffraction limited. The numbers I git out of the run are: RMS: 1/13.9 PTV: 1/2.1 (Ignore this one, PTV is almost...
The Roddier test is sensitive to focal length, and if the camera position of the Toucam had the C925 operating at, say, f/12 (2820mm), the RMS becomes 1/16.6...
Thanks for the results, looks like I barely squeak by diffraction limited. The color of the star was blueish..but I think there might be a white balance issue...
I did a query out to see what focal length a SCT operates for prime focus, such as when a Toucam with no diagonal is attached, and it seems it's pretty much...
Just learned of this tool on another forum and don't know much about it. I am intrigued by the prospects, but after looking through some of the archived...
Hi Kevin, The Strehl ratio is the ratio between the amount of light in the Airy disk for the scope and "some other number." Usually the other number is the...
Thanks John, you've been most helpful. I see in looking at the examples and tests that the software is in French. Is there a page with some translations or...
Hi Kevin, Some answers below.... ... No, we do not have an english version of the software. The Cookbook in the Files section is in english, however, and...
This is fantastic news! New version 2.0 is much more user-friendly with regard to setting thresholds and aligning the images. This is an area where people...
Good news. I did hear back from the programmer Lequevre who will try to join us here. And he mentions he is interested to make an english version also. I...
I'm interested in seeing some good data on SCT quality particularly the Celestrons. Also John B. I saw one of your old posts about testing a c14. I'm ...
Hi Greg, ... There are a few tests on Celestrons in the files area. My impression so far is that most have good glass. Though typically we see several...
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