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I actually removed some of the shims, I dont know if it changed the situation. I'll continue to experiment. Might just leave one shim in there (which is necessary). The astigmatism isn't severe, stars are visibly oblong but not greatly so just inside and outside of focus.
The mirror itself is premium quality, so maybe it is those shims or it could be the fact that the secondary is housed in a sleeve.
Last edited by 你B; 01-03-2008 at 01:48 PM.
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