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...
Mick, I placed the recipe for creating test images using Aberrator30 and the images used in a folder called Perfect150. Let me know what you think. Glenn ...
... Mr. Jolly - splendid. I will get back at this investigation today (Mon 3 Nov) or tomorrow and am most interested to see what comes of it. Thanks much for...
Group in the referenced message, second paragraph of my reply, the following statement is made: "Each image was around 900 frames out of 1024 stacked in...
Roddier users: Should have cautioned the following about the use of Aberrator as a means to generate test images. The images created including the PSF and...
Hi Mick, I finally got a chance to start catching-up with your excellent tests from October. I put a PDF file in Files > Test Results Comparison > Comparison...
... Dr. Biretta - welcome back and many congratulations on getting Hubble operating again. ... Seems like the above must be important points. I have not been...
Hi Mick, Here are some thoughts: 1- I would think that Roddier was optimized for an obstructed scope because I believe it was originally designed with a...
... Results ... and ... astigmatism ... with ... out ... usually ... Introducing CO to an imperfect optics WILL change resulting Zernike coeffitients....
Two points: 1)Aberrator can be used for qualitative checks only. As I said earlier, Aberrator uses what Cor Berrevoets calls a special gamma function for...
Mick, Glenn, et al., A couple quick thoughts on this Central Obstruction business: (a) I think there is indeed something to the Aberrator gamma problem. I ran...
Dr. Biretta/Mr. Jolly/Group - profound thanks for the extremely interesting and useful discussions of my test images/analyses and their interpretations and...
Hi. I usually think in terms of pixels. Between 80 and 150 pixel diameter for the star images seems to work well. I don't know what detector size you have --...
Thanks John, I used a Phillips SPC900 webcam which I think is 5.6 micron/pixel. When you say blank space around the star images do you mean when you select the...
... OK, so that chip is 640 x 480 pixels. ... you ... covers ... Yes. ... For you detector, you want images that are between 1/6th to 1/3rd the height of the...
... Group - using some suggested technique improvements from experienced group members (wider image crop window with images further from window egdes,...
... snip ... In other words one wants an image about 100 or 200 pixels diameter, right? I am working with a monochrome astro camera (ST2000) not a web cam. Is ...
IIRC, the original Roddier test required at least a 16-bit camera. Averaging was done by a 30sec exposure. The details are in the Roddier paper in the files...
Group - the title line for message #595 is erroneous and misleading. The tests discussed in #595 were not done using simulated images but were on images of...
... Yes, thats about right. I usually aim for 80 to 160 pixels diameter. I've gone as low as 40 pixels with reasonable results. There is some trade-off...
Mick, I think you have good results with the C6R - you know you need that mask and you end up with a really fine 5.5" instrument! I'm interested in your 10"...
... Mr. Jolly - thanks for the interest and advice that the Newt mirror is probably pretty good. Concerning the 10 inch newt: I have been assuming that...
I'm trying to get the program running using the C11 test images in the files section. After I open the files and set the parameters, I click on the tests...
Hi Bob, Maybe I see what is happening. The thresholds have not been set yet, and the default thresholds do not work for those images. Try this.... Using...
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