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Afraid so Ken - my GSO O3 filter! The DSI 3 does pretty well under about 20 degrees. Really even a cooling fan might just about do the trick (have to try and rig something up).
Working on those clear skies but unreliable tonight. Looking forward to the crab and eskimo hopefully. (Crab was behind the only tree to the north at the time!)
Thinking about a 1.25 inch baader narrowband set (approx 450 us for set of 4?). Have you been happy with yours?
Cheers
David
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