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Old 18-02-2008, 01:18 PM
bird (Anthony Wesley)
Cyberdemon

bird is offline
 
Join Date: Jan 2005
Location: Rubyvale QLD
Posts: 2,627
It all depends on where the secondary mirror is attached to it's vanes - there are two different arrangements normally used, and you'll see different results for each one.

The two styles are called "offset" and "non-offset" (or "partially offset"). Before you can tell if you're seeing the right things you need to know which of these applies to you :-)

Most commercial scopes will go with "non-offset" secondary attachment, in which case your original image shows very good collimation. The small reflection of the secondary mirror should appear off-centre, that's normal.

There are many good resources on the net for help with collimation, google is your friend :-)


cheers, Bird
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