Hello everybody, I'm trying to get a handle on doing this testing correctly, and then repeatably. The scope I'm testing is a 10" f5.47 with a 1.83" diameter...
Hi Bob, After puzzling over your images for a while, some comments: I think your basic technique is sound. The images seem well exposed without obvious...
Hi John, Thanks for the informative reply. The camera is an Imaging source DBK21af04.as. The CCD is similar (maybe identical) to the ToUcam. This is a RAW...
Interesting report! The use you are putting the Roddier test to is one of the reasons I think it's so exciting. Try the test again on a single star as high...
Bob, Looks like you have the technique well in-hand, and just need some better seeing, and maybe a little collimation work. These seeing "slow waves but very...
Hi Group Last week I tried to take 1 sec, 10 sec, 30 sec and 60 sec images of the star Dubhe from 3mm to 9mm outside & inside of focus using the green filter....
Hi Chris, If I recall you are using a conventional CCD camera in a 132mm scope? Yes, it is likely far over-exposed. I use very bright stars, but I am also...
The Roddier test does not use the classic star testing diffraction ring pattern that we are familiar with from visual star testing. The images are taken much...
Yes, like Philip says, it would be good if you could take lots of short images (<1 second to few seconds) and then stack them up. This also avoids potential...
... Hi Philip and John Thank you very much for the suggestions. I will try a 4 to 5th mag star tonight and take < 1 sec exposures. Philip, I looked at your ...
Chris, Yes, the images are just far over-exposed. There is a fainter star below and right of the bright one, and that shows rings and nice details. That is...
... Hi John I get the idea now and will try it again tonight. I will post the results tomorrow. Thanks again! Chris A ... mag ... section ... (see ... and ... ...
Chris, It would be a good idea to use a star that isn't a tight double: Dubhe (SAO 15384): AB: 1.8+4.9Mag Sep 0.46" Depending on the aperature of your scope,...
... Hi Mike Thank you very much for the tip. My seeing conditions are not co- operating too well and it's usually like that here during the winter season....
Chris, I encourage you to try it if you have the time - regardless of the seeing...esp if stacking. It's pretty interesting to play with. Clear skies - Mike...
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roddier@yahoogroups.com
May 2, 2007 10:41 pm
132
Hello to all, Finally I've been able to collimate my scope more or less, in bad seeing conditions, so it has to improve more. I've tried to run the roddier...
Hello Mert, I can't get the images to successfully process. It is vital that one not make adjustments to the image that result in changing the raw data....
Mert, I had a quick look at the images in FitsView. Couple things I did not like. The background in the images is like -29000 which indicates some FITS...
Thanks Philip for your fast response, I will try again, with raw images, no processing, and maybe even better no stacking either! With regards, Mert ... ...
Hello to all, This time I took some time to read the manual ( :-) ) and get some raw image from the avi's. This raw image was split into RGB and I used the ...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the roddier group. File : /SW 150-1800...
roddier@yahoogroups.com
May 3, 2007 6:31 pm
139
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the roddier group. File : /SW 150-1800...
roddier@yahoogroups.com
May 3, 2007 6:31 pm
140
Hello John, Thank you for your fast feedback! I don't like the images either but this is what I was able to get yesterday night after collimation. Collimation...
Hello to all! Today I've been busy with a "little" pinhole of 0,1 mm diameter punched through a steel plate of 1.5 mm thick. This with a sharp pointed...
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