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Hey Les, done similar things at my Clayton house. SQM reading of 21.5-6 on regular basis. I have had a DIM measurement done there too and it came up with 1 arc second on average but peaks as good as 0.70 arc seconds. The readings were taken on a night I thought were less than average.
Like you said easy to boast what the conditions are like; numbers are proof though. I had thought the DIM would come up well with around 1.5 arc seconds but the readings were done by our instruments officer and I think he was quietly peeved that the numbers came up so good. The SQM readings were taken late summer to even out the zodical light influence.
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