Quote:
Originally Posted by MattT
Hi John,
Hope I didn't give you a bum steer with the laser  Malcom I thought the laser was the be all and end all of collimation....obviously not , will give astro babys method a go and see what happens, thanks for the link. John as Erick says when you get the scope back to where the views are good I suppose it doesn't matter about how far out or not you are according to lasers or any thing else. For me I guess I'm not that fussy about whats at the eyepiece, as my favourite scope is the 6" refractor, with all the CA that goes along with it! Coma in the Newt doesn't bother me either so maybe close enough is good enough for me.
A frustrating hobby at times but nothing worth doing is ever easy.
Matt  |
Just another quick point. Coma in a newt is an inherent property of the design, it arises from using a parabolic mirror. No amount of tweaking collimation wil get rid of it. Having said that it varies markedly with the f ratio. At f6 it is barely noticeable, at f5 it is noticable but for visual use not significant, at f4.2 it gets annoying.
Erick is right, in my view. The important thing is the quality of the view, and especially with smaller, slower newts, spending hours trying to get colimation perfect is not time well spent, better spent actually observing.
Malcolm