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the biggest problem I've had with NB imaging of M42 was taming the core... you can take a bunch of short subs as per normal, however I've had the odd spot of trouble getting enough stars for programs to actually register and stack the shorter subs together.. Had to rely on manual stacking.. Even then, it got a little messy with 10s subs as even manually I couldnt see stars...
Good start to your narrowband imaging! You will find that there are limitless possibilities waiting for you... And 99.5% of all other emission nebulae look better in NB than M42... I suppose that last bit is a personal thing though...
Good going.
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