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As alluded to above, the longer exposure isn't necessarily better, due to the charge capacity of the individual pixels in the camera sensor. As you approach full charge capacity, or saturation, they start behaving non-linearly and you begin to lose data. If you care about the data in those regions, yet have a good mount that will track forever without trailing or PE creeping in, you need your exposure times set to around 70-80% of what will saturate, unless you are playing around with HDR.
Eric
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