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Old 28-03-2006, 02:01 PM
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Starkler (Geoff)
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Join Date: Sep 2004
Location: Melbourne
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Quote:
Originally Posted by rmcpb
. For the first time I could see festoons without even trying!! The equatorial belts have always been easy but the temperate belts were visible, the GRS was clear, I couldn't believe it.
Rob Its great that you are happy with the way your scope performs now but I have a question.
Did you ever check your old secondary mounting for pinching or astigmatism?

If you are seeing a huge difference in image quality I would suspect that something was wrong in your old setup other than a bigger C.O. alone.

I saw somewhere simulations of planetary images with various sized central obstructions and the difference between 20% and 25% was very subtle indeed.

In short, It's well worth checking the existing setup for issues and then a new GS secondary only costs about $50.
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