"Alan W. Craft" wrote in message
...
On Wed, 17 Sep 2003 22:10:58 GMT, "jojo"
....reflected:

how do I know if I need to culminating?

I take it that you have a Newtonian; a reflector; mirrors?

Tell us the brand, and the diameter of the primary mirror/lens.

Alan

Alan,
It's a Bushnell (this is where I insert justification. It was a gift. It is
better than nothing)
675x4.5" Reflector
Focal length (mm)
900
thanks....
jojo