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Its been such a long time since I used it I don't have a good recollection.... If it's collimated I seem to remember it's ok. Becuause it's reasonable fast (f/4.8) and only 152mm it give a wide field of view - so the stars look small. Becuase it's more of an astrograph, you might not have enough backfocus for a diagonal though...
James
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