Quote:
Originally Posted by Renato1
Thanks very much Jason,
Very interesting. I'd been thinking of ordering one till I read what you just wrote.
Here is my question for you. I have a truss dobsonian which I have to assemble every time I use it. And every time, I have to use a Cheshire to make adjustments to get the little dark spot dead centre into the middle of the annulus in the middle of my primary. The more concentric the spot is in the annulus, the better the image.
Is it worth getting an autocollimator - other than for checking that something isn't slightly out with the secondary mirror (I was never that confident using the cross-haired sighting tube that I initially used)? Is it something I could get collimation right with in a minute or two after assembling and using the Cheshire? Or is it going to take another half hour of fiddling around?
Thanks for any assistance you can give me on this intriguing issue.
Regards,
Renato
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I use my cats eye cheshire and autocollimator every night i setup, I also have the sight tube but I only use that when I take the secondary out of the scope. I have found them to be accurate and easy to use, and when I have all the reflections lined up I know that the collimation is perfect!