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My guess is that it is cloudy again in Sydney .............
@ Rene, being new to the forum you may not be aware that these threads sometimes come up, usually on cloudy days or at times when one's imaging gear is being serviced. In this case the OP is a seasoned astrophotographer who produces a string of nice images but sometimes gets bored and throws in some bait for conversation/entertainment.
It is a bit like asking how much water is in a lake, without specifying which lake, which season or like how long is a piece of string.
In this instance the only correct answer is actually " an 18" dob "
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