Thread: 8" F/4 atsrograph advice needed.
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Old 16-02-2012, 06:17 PM
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Lester
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Hi Justin, the first thing that comes to mind is, do you have the secondary offset? Some months ago I did a collimation on my Takahashi F3.3 astrograph and had the secondary centred; the results were aweful, till I offset it.

All the best.
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