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Old 08-09-2017, 11:59 AM
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Join Date: Sep 2017
Posts: 23
Hi all,

I'm very new to this and only just put together a collapsible dobsonian 8. Waiting for a clear sky in Melbourne to give it a go.

I have a question - what is collimation and how often should you do it? From what I've understood it's simply a process of aligning the eyepiece and the primary mirror. Is that correct and do I absolutely need a laser accessory to do it as a beginner (it was suggested to me by someone else)? Also why does it need to be routinely done i.e. why does it go out of alignment after a while?

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