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Dave, I’m certainly no expert and some folk here can give some much better advice on this topic. From what I’ve read though, you need to consider the seeing for the night in question. If your resolution is at a third of seeing, then bin 1.5; if your resolution is a quarter or less, then bin 2.
If you’re worried about binning and following nights having excellent seeing conditions where you wouldn’t wish to bin, you could either consider not binning at all, or you could set up multiple targets that you image depending on your seeing.
I think at 0.3 though you could definitely consider binning even under excellent seeing. Binning 1.5 will take your resolution to 0.45. So seeing would have to be better than 0.9ish to even start losing out on resolution.
Resolution is a fascinating topic, and I too would be interested to hear what others might have to say as I am still new to this hobby. For example, does deconvolution really “undo” some of the blur from seeing? What effect could that potentially have on decisions to bin?
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