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Old 19-07-2018, 08:46 AM
Zuts
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Zuts is offline
 
Join Date: Mar 2007
Location: sydney
Posts: 1,830
Quote:
Originally Posted by multiweb View Post
In practice if you have your artificial star at least 20m away you won't rack your mirror forward off the baffle tube so you hit the retaining clip. Just use extension tubes at the back to reach focus. It's good enough for collimation. The optimum distance between the mirrors is there so you don't get spherical aberration which is important for viewing or imaging but doesn't matter for collimating. Visually you'll only see a difference in brightness in and out of focus but the rings will still be concentric.
Hi Marc,

There is a laneway next to my house which will probably give me enough distance so I'll try there.

A bigger backyard without trees would be a good upgrade for my 25 buck artificial star but funding it may be an issue atm

Cheers
Paul
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