netwolf
12-03-2007, 12:09 AM
Well I did not plan these but I started the night and 9pm to try and improve my focusing efforts on Saturn. Till about 2am I tried, when I moved on to the Moon and then onto Jupiter around 3am. I tried the 5x but not happy with the results, better than Saturn I actually could get see some detail on the screen. I guess the moonlight is working against me and also it was not very hight yet. I was about to pack it in when I thought I would give Jupiter a try. Why not..
Anyway best results without Barlow (really need a 1.25" 2x). Focus was a bit better less of a problem, my method is to set to full auto and try focus until the big white blob is as round and small as I can get it. I think this is the same as reducing the FWHM value using the focus tool on a star. I used Metaguide to collimate that, it makes it so simple and idiot proof. I turned the wrong one first saw immediate results and turned it back the second one was the right one to adjust. Took lots of videos of Jupiter but all seem to produce similar results. I know I can do better.
One point I was reading Mike's tutorials online while imaging, very handy link to have. I got Pixinsight beta to mimick some of Mike's Astraimage steps but the most I did was adjust levels. I can not work out where RC deconvolution is on the beta version, its not under process's. The pics were cropped resized and converted to jpg in some free photo editing software that came with my Canon camera.
I cant belive convolution is back in my life, did not think I would ever find use for that stuff. But it seems a bit odd to use without knowing the impulse response of the optics. So I tried to grab an airy disc image of Sirus while as the first thing I did last night. I am hopping to try this out with Iris, add it to a image and then use it as the impulse response to deconvolve from. I tried generating a artificial one using the draw command but did not have much luck with that. I am thinking perhaps such impulse response for various optical components would be handy to have to remove there effects. Surely manufacturers could provide such images to the public. But best would be to capture it ourselves for the particular optical train used. But what would be the best star to use, Sirus seems to bright. U can see the airy disc in the EP but not on via the ccd. Need a lower mag star. Any tips?
Regards
Anyway best results without Barlow (really need a 1.25" 2x). Focus was a bit better less of a problem, my method is to set to full auto and try focus until the big white blob is as round and small as I can get it. I think this is the same as reducing the FWHM value using the focus tool on a star. I used Metaguide to collimate that, it makes it so simple and idiot proof. I turned the wrong one first saw immediate results and turned it back the second one was the right one to adjust. Took lots of videos of Jupiter but all seem to produce similar results. I know I can do better.
One point I was reading Mike's tutorials online while imaging, very handy link to have. I got Pixinsight beta to mimick some of Mike's Astraimage steps but the most I did was adjust levels. I can not work out where RC deconvolution is on the beta version, its not under process's. The pics were cropped resized and converted to jpg in some free photo editing software that came with my Canon camera.
I cant belive convolution is back in my life, did not think I would ever find use for that stuff. But it seems a bit odd to use without knowing the impulse response of the optics. So I tried to grab an airy disc image of Sirus while as the first thing I did last night. I am hopping to try this out with Iris, add it to a image and then use it as the impulse response to deconvolve from. I tried generating a artificial one using the draw command but did not have much luck with that. I am thinking perhaps such impulse response for various optical components would be handy to have to remove there effects. Surely manufacturers could provide such images to the public. But best would be to capture it ourselves for the particular optical train used. But what would be the best star to use, Sirus seems to bright. U can see the airy disc in the EP but not on via the ccd. Need a lower mag star. Any tips?
Regards