View Single Post
  #3  
Old 02-12-2010, 10:39 AM
Kal's Avatar
Kal (Andrew)
1¼" ñì®våñá

Kal is offline
 
Join Date: Nov 2006
Location: Sydney
Posts: 1,845
You can't tell by taking a photo of the mirrors.

You need to defocus a star and look at the patterns it displays. You should see a large white circle with a smaller black circle in the middle, with nice concentric rings going out from the edge of the black circle to the edge of the white circle.

Have a look at this picture for an example, the image on the left is a telescope that is well collimated, the picture on the right is a telescope with poor collimation.
Reply With Quote