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G 9.25 Collimation

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Posted by William E. Jones on February 28, 2002 02:33:37 UTC

I have a G 9.25 that that seems to have an unusual out of focus appearance. When slightly out of focus the innermost diffraction ring looks like a pie with a narrow wedge taken out of it. It is the same on either side of the focus. I have had the scope for a year and once the G5 mount was greased and given oak legs is very stable for visual use. Yet the image even on the clearest of nights never seems stable much above 150x, so I am wondering what this odd pattern I keep seeing indicates and if it is limiting the capabilities of the scope? Anyone have ideas?

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