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That point from Stuart reminds me of another thing to check. SII! For some objects, this channel is really useful. But many others, don't bother burning your integration time on Sulphur. Best think to do is take a 10 min exposure of each of Ha, OIII and SII on your object, and then evaluate the image. From there you can work out final framing, whether to do SII, and also get a guide as to whether you need more time for the channels you are going to use. It's 30 min well spent at the start of a project.
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