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Tony,
I am suprised you could get any trace of that outer ring with 67x30 second exposures + unmodified camera even with 10" aperture! Thats quite an achievement.
I reckon this object - from my location and scope - would need about 3 hours + LP/Nebula filter to get that outer portion acceptably smooth and I am not a big fan of noise reduction (although I used just a touch in that image).
Terry
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