Last night was the first night I tried to use my Hubble Artificial Star. I used a Celestron SCT 8" with my ZWO294 camera connected directly to the OTA. Although I had success (see image), I'm wondering if this degree of collimation is adequate? Should I have used a 2x barlow between my camera and the OTA? Also, I wasn't able to create more deffraction rings, does that negate the collimation?
Much thanks,
Joe
Collimation: first experience with artificial star
Collimation: first experience with artificial star
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- 8_2066.png (419.38 KiB) Viewed 1867 times
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- 10_2066.png (663.79 KiB) Viewed 1867 times
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Re: Collimation: first experience with artificial star
Hi,
I thought the other pattern was supposed to appear as you moved closer to the focal point – you may need to remove choose the exposure or the brightness to avoid that being swamped out. I expect you have seen this page - http://www.astrophoto.fr/collim.html
By the way, you have a very rare image there – an image taken through an SCT with no sign of convection current effects!
Cheers, Robin
I thought the other pattern was supposed to appear as you moved closer to the focal point – you may need to remove choose the exposure or the brightness to avoid that being swamped out. I expect you have seen this page - http://www.astrophoto.fr/collim.html
By the way, you have a very rare image there – an image taken through an SCT with no sign of convection current effects!
Cheers, Robin
Re: Collimation: first experience with artificial star
Thank you for that reference Robin, it really helped.
Joe
Joe
Re: Collimation: first experience with artificial star
I have also tried tried an artificial star collimation for the first time.
Unlike the proper round star above, I had simmering light from my artificial star in the garden. I had sort of concentric yellow and blue rings that swapped places as I moved from out of focus through focus and out of focus again.
As of now I don't know what to make of it and based on the attached images I don't know if I have managed to collimate my telescope successfully.
Unlike the proper round star above, I had simmering light from my artificial star in the garden. I had sort of concentric yellow and blue rings that swapped places as I moved from out of focus through focus and out of focus again.
As of now I don't know what to make of it and based on the attached images I don't know if I have managed to collimate my telescope successfully.
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- Screenshot 2020-11Art Star3.png (216.19 KiB) Viewed 1629 times
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- Screenshot 2020-11Art Star2.png (261.82 KiB) Viewed 1629 times