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Hi Kev,
Some images for comparison (3 from 450D at ambient, and 3 from QHY12 at -15C).
Note that I've cranked up the colours and applied Noel Carboni tools heavily on some of these.
ED80 is used with William Optics pflat2 flattener/reducer giving f6.
GSO RC8 is used with a TS flattener leaving the focal ratio close to f8.
Hope this helps.
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