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Danh,
I only use Newtonians ( f4.9 to f6 ) to image and observe
I use an Orion Cheshire to align the secondary mirror first then the primary and a laser to finish and double check both. 9 times out of 10 the Cheshire ends up being more accurate than the laser especially for imaging
Here's a good tutorial I found 3 years ago from Starizona on how to collimate a newtonian
It may help you
Cheers
Martin
PS: Ive used Astro Baby as well
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