Star Collimation- Lessons Learned
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- Опубликовано: 11 окт 2023
- Tonight I'm taking a few minutes to do a star collimation on the 8" RC. This is part of my nightly routine, and we are starting from the raw laser collimation with the Hotech Advanced SC Collimator.
We will compare 'pretty good' collimation to 'a little better' collimation by doing an auto focus routine on both with NINA Hocus Focus. Then we will have a look at some asteroids and see what our limit of detection in my Bortle 3 Sky (New Moon) turns out to be.
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The hand heat demonstration was spot on. The out of focus stars looking as if "in water" is simply because gases are "fluids" too, and there's good amount of them between the telescope and the star.
This video was very interesting. Congratulations on the excellent collimation and observing a 19.7 magnitude asteroid.
I recommend viewing the video on full screen.
I actual got a 20.1 asteroid as well
Very interesting, Thank you.
Glad you enjoyed it
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Nice vid!
For my Schmidt-Cass and Mak I use a variation on Ross Lunsford's 'blue ghost' collimation method. It uses a centered light source where the eyepiece or imaging plane would be, and results in multiple internal reflection paths. You just make the multiple rings concentric to each other, and you're done. Using target board also helps. In many ways it's like a HoTech collimation, but with multiple passes.
Great tip!
nice
Thanks
what was the article that wasnt moving in the lower right corner of the second example?
On the display there is a small, magnified version of the target (in the crosshairs). This is to aid in determining if the object is a true detection. This is in a small box in the right lower corner of the animated image.
Thanks for your explanation. I live in Brazil, I dont speak well, but let´s go. I have an Schmidt-Cassegrain Telescope LX90 Meade 12” (305mm), Auto Coma Free (ACF). I am encountering difficulties while collimating the device. I can't collimate the telescope so that both the intra-focus and extra-focus are perfect (concentric circles). If one is perfect, the other is imperfect, and vice versa. When I say intra-focus I am using the focus adjustment knob in the way that I am moving the primary mirror from bottom to up, and when I say extra-focus, I'm moving the primary mirror from top to down. Theoretically, the image (centered circles) from intra-focus and extra-focus should be the same. If one is correct the other should equally correct. But, In my case it is not. Do you know something that I could do? Have you test your collimation for intra-focus and extra-focus to know if both are the same? I don´t know if you understand my explanation and I don´t know if the terms intra-focus and extra-focus are being used correctly, they may have other names.
It´s totally strange this result. I know that what I am saying is counterintuitive, but it is happening to me. Imagine that I'm looking at a star that is in focus. Now, I move the focus knob in a way that the primary mirror moves downwards and forms the image with concentric circles, and they are perfect. Now, imagine the star in focus again, and this time I move the mirror upwards, and the circles in this condition are no longer concentric. They are no longer symetric. How is it possible for this to happen, if the configuration is the same? If you have any tips, I'll be grateful.