IC 4406 in Narrowband
aka the retina nebula. Only managed (all 150s) 9x ha, and 5x of OIII and SII due to clouds coming in the past two nights, but I'm probably going to move on to something else now that the moon's rising a little later so I thought I'd share anyway.
It's fairly bright (one source says 10.2) and about 1.8' in length.
Of course last night I was getting the best guiding I've seen, and only managed to capture the measly 5x OIII and SII before the clouds blew in.
Colour blend was fairly arbitrary:
R = SII * 0.8 + HA * 0.2
G = OIII * 0.5 + SII * 0.5
B = HA * 0.8 + OIII * 0.2
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