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Originally Posted by Jason D
Bear in mind that barlowed laser can only be used to align the primary mirror.
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Indeed.
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It is possible to achieve perfect collimation. Collimation is about aligning optics. Whether the secondary mirror or the primary mirror are well-centered in the OTA or not is irrelavent.
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I tend to agree. You can always achieve perfect collimation by looking at star images in and out of focus and adjusting the mirrors to get as close to "textbook" as possible (leaving only mirror defects). The only problem is that this is very inconvenient if you can't be at the eyepiece and the collimation screws at the same time. Hence the multitude of collimation aids.
I'm often fantasising about servo motors at the primary collimation screws and a little hand-held pad for adjusting them while looking through the eyepiece. I'm afraid I'm not handy enough to make that myself – why is there no commercial solution for this?
Cheers
Steffen.