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Hi Greg - the big advantage is the huge increase in SNR - I calculate it at over 30% - no wonder the imagers in the USA are into New Mexico Skys sites - they are up around 6,000 ft. The big disadvantage is in the wind - it blows constantly 50kph to 80kph. NGC 5139 was taken as a test image to compare with others taken at different sites and altitudes.
Cheers
Geof Wingham
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