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Hi Greg,
Yes, the observatory is in Rylstone, but totally automated. I can image from inside the house, or Los Angeles. It's very cool.
Leo, It's best practice to shoot new flats on rotation, Whilst the majority of dirt is on the filters and CCD/CMOS cover, the light cone may or may not be symmetrical, even with a refractor. And, on a reflector, I suppose the vanes are in a different position upon rotation.
P
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