First Scope Focusing Problems

[jobiwan kenobi]

Hello

I'm very new to astronomy but my farther and I each brought a Celestron First Scopes about 2 weeks ago and have been enjoying them ever since.

I have noticed a difference in focusing between the too scopes. One scope seems not to focus as well as the other, the image appears less shape when compared to the other identical scope.

This is true regardless of eye piece used so I'm guessing the problem is between the two mirrors.

Has anyone had a similar problem and could anyone suggest how I can improve the focusing and image of the scope??

Many thanks

-Joe

[Capricorn]

You could be correct in that it is the mirrors. The scope is very fast and also nothing says parabolic in the specification I can read.

Assuming both mirrors are identical and that it is not the eyepieces then the next is collimation. If one scope has the optics a bit more out of alignmnt then the other then the image will suffer. Again especially on a fast scope and f/4 is fast.

Now the catch, a collimating tool will cost about £30 which from what I can see is close to the cost of one of the scopes.

[jobiwan kenobi]

Cheers for the advice ... i've been looking into Collimating tools looks like I might have to jump in and get one.

Cheers