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Nice image but i can not grasp the need for super long subs in narrowband. Cameras like the ultra low noise, high sensitivity ASI1600MM-Cool are getting very nice results in narrowband with 300" (5 min) subs, sure you need a number of them, minimum 20 probably, but it makes mount, guiding, much less probkematic. I don't want to take anything away from the image posted here, but talk of 30 min narrowband subs is rapidly becoming 'old school' with the new camera developments.
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