Thanks Rob.
I thought three hours would be plenty but have zero experience with Ha. I started off with 5 min subs and then thought better of it.
It looks like we are going to get a few good nights however unfortunately during the week! I haven't needed to bother with dithering so far due to flexure however I think I've now got that under control (it has added quite a few kgs of weight to the imaging rig though!) I have trialed dithering using nebulosity/phd and it is pretty simple to set up.
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