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Hi Bert
Great image there. heres my effort with your lens, though not as deep only 3x5 mins with UHC-S filter. I dont know if its because I set up your lens at least 1/2 hour before imaging and temperature has stabilized, but focus doesnt seem to change between exposures. It may change slightly if I point to another part of the sky, or after an hour or so has elapsed. With the UHCS filter when trying to balance the sky background sometimes, as Striker points out there can be a reddish cast, as if the UHCS filter really amplifies the red , which I guess it does anyway.
Scott
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