Hi all, I'm sure I've read this before somewhere but still unsure of the theory ...
Am I correct in thinking that when stacking, 1 to 2 Half's the noise, then 2 to 4 Half's again, then 4 to 8 ... 8 to 16 etc.
So going past 16 really needs a massive investment in time ?
Also where does sub length come into this ? I use a ZWO 1600 pro and seem to get good results in my bortle 7 / 8 zone with 300 seconds at unity gain.
Also, now sure that (as I've been told but wanted to see for myself π) that only Ha cuts through the Moon glow.
Due to time restraints I've been aiming for an hour per filter but this equates to 12 subs so I guess I need to grab an extra 4 to see the benefit ?
For completeness and a recap ...
300 seconds / gain 139 / ZWO 1600 pro / f4.9 ZWO narrowband filters.