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Okay, I just tried it again with the lenses oriented like they were in the pic above (there were shadows of the shims still visible to help me do that), and the rings are way off center.

They're right on center with the arrows aligned, though. The shims look like they have a weak adhesive on one side, and they're all regularly sized - 1/4" long by 3/4" wide.

-Tim.

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Excellent! You just figured it out.
It appears the 2 elelements have shifted and the test revealed that. I would have done the monchromatic light test before and determined the current alignment. You just did it the other way around. Good and it proved very successful...

See..how much a little education can reveal....?

Now you know a bit more on how to align and even test your objectives elements alignment.

This is the best kind of way to educate yourself...and it didn't harm a thing.

Dave is to be warmly thanked for his acute attention.

Rob

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A great place for amateur astronomers, and ATM's to come and enjoy their hobby.

http://tech.groups.yahoo.com/group/HomemadeRefractorTelescopes/ My homemade refractor group.

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