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I'm largely with you Paul. Definitely longer is better with both total exposure and subs. But of course practicality kicks in and clouds, bad weather, moon, work all conspire to reduce total available time. So that is the goal to take long exposures but sometimes you've got to take what you can get.
Also some bright objects don't seem to gain too much from longer exposure times or with small well cameras a 15/20 minute sub even 30 minutes may blow out highlights.
So its not a rote rule. Some judgement is involved in my opinion.
Greg.
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