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Old 15-04-2013, 09:05 PM
ausastronomer (John Bambury)
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Join Date: Mar 2005
Location: Shoalhaven Heads, NSW
Posts: 2,620
Quote:
Originally Posted by raymo View Post
The collimation is not affected by collapsing it. I had mine 3yrs. and tweaked the collimation twice in that time

raymo
Raymo,

You keep offering people advice and it is fairly obvious to me that you are just offering it for the sake of it, without really having much idea of what you are talking about. While you might think you are being helpful, you are not, because you just muddy the waters and the original poster doesn't know who to take notice of.

In regard to your comment which I have requoted above, let me say this:

If you have owned a Newtonian telescope (and it doesn't matter who made it) for 3 years and only tweaked the collimation twice in that time period, one of the following things have happened:-

1) You have only used it twice.

2) You haven't got any idea how to collimate the telescope.

3) You don't care, or take the time to collimate the telescope properly. This is a very common problem with a number of experienced observers and beginners.

4) You have over tightened the primary mirror clips which will prevent the primary mirror from shifting, which may reduce the need to collimate the primary, but will induce astigmatism which will degrade the image quality in any case.

Does anyone else own a collimation free Newtonian like Raymo? I haven't managed to find one in over 40 years of using some of the highest quality newtonians on the planet.

Cheers,
John B
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