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Dave,
I have the QSI683ws8 and 1 1/4" LRGB & NB Astronomic filters loaded in the 8 position wheel.
It works, easily hits -20 all year round and doesn't dew up. Best money I've spent on Astrophotography. Wondering if I should have spent a bit more to get the oag version upfront however I suspect I could replace the front cover if I wanted to go that way. Troy converted his 583ws5 to a 583ws8 without too much fuss.
Peter
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