Quote:
Originally Posted by mak15
I just looked at the collimation site from Alan(above). If it is correct I have spent hour after hour after hour trying to achieve the perfect concentric collimation with my f4.5 12" DOB only to discover that some 'offset' is quite normal in fast Newtonians. If this is correct I will sleep a lot more easily tonight!
Thank you Alan
 Stew
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I didn't find out immediately either, but luckily just after a couple of days. Being a perfectionist, I was starting to lose my sleep too. It was a relief to find out!