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Until my mono camera arrives (Fingers crossed it is in the batch ZWO are currently shipping) my only real option for noise reduction other than software is averaging it out with more subs, that is my preferred method actually.
That takes a while with the sky as it has been and doing 600 sec subs. If the mono cam arrives soon I might shoot another night of RGB with the OSC camera to really smooth that out, before flipping the filter wheel on to the new mono one and then spend several nights doing the NB subs from scratch. I might even have my Sii filter by then too, though it is a "Birthday" present so I am not allowed to use it until mid next month even if it does show up!
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