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Nice work Greg. I'd be pretty surprised if you didn't pick out the faint Ha shell with 17" operating at F4! I recall when I imaged this target with a 24" RC operating at F8, I needed 900s subs to pick it up. Mind you I was operating with a back illuminated ccd with at peak QE of 98%. Your rendition is coming along well. Hope to see the finished result assuming it doesn't get too low for you to complete the project. Well done.
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