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QHY-9 ultra-widefield now in colour
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25-08-2013, 07:07 AM
George Ionas
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Join Date: Apr 2010
Location: New Zealand
Posts: 233
The distance available is so tight that the 18.5mm thick QHY9 filter wheel was substituted for the 15mm filter-draw from TS-Services to gain that extra 3.5mm.
George Ionas
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