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Thanks Josh, Ross and Ray. I appreciate the feedback!
I am fairly happy with both the detail and the image scale. I was surprised I could do this well imaging at .55 arc sec, though I certainly am paying a price in light gathering ability at double the TEC's normal focal length. My 4 hours is probably the equivalent of 1 hour at f7 (or less considering the light loss of the barlow & ONAG), but I think I've got a nice close up image with perhaps more detail. To confirm I guess I ought to do an hour of lum at f7 and compare.
Peter
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