First Attempt at Narrowband with Hyperstar NGC6888

[Ikonnikov]

My first attempt at a NB image, C8 hyperstar on HEQ5 with Baader 7nm Halpha filter and Atik 428EX, 5x15 mins, 7x10 mins. Not a very novel subject but it’s at a convenient place in the sky at the moment…

Subs were not very sharp despite careful focusing, I suspect poor seeing and slight haze were the main problem, no sign of focus drift between subs. PI deconvolution using a PSF generated with Dynamic PSF seemed to help a lot and I’m quite pleased with some of the finer details appearing in the nebula after subsequent processing (masked stretch, HDR transform, ACDNR and LHE). Was a bit worried about artefact generation in fine detail though it seem to correspond fairly well with other images I’ve found on the web.

I’ve not got the hyperstar collimation quite right with somewhat elongated stars in 2 corners so need to work on that, and brighter stars need some more masking to stop them turning into donuts. I’m considering trying out PI drizzle integration with more subs to see if I can squeeze some more resolution/detail out of this subject (only at a fairly coarse 2.22/pixel with this setup). Also have OIII filter now so hope to add that at some stage once I get the data.

Thanks for taking a look, any comments appreciated/welcome (especially on processing; do you think I have over-done it a bit?)!

[oldpink]

I've not even thought about narrow band but I love looking at them
for a first attempt I'd say that looks really nice to me though I'm no expert I'd be more than chuffed to get an image like that

[cosmicdonkey]

Fantastic image. Can't wait too see more added to this

[red dwalf]

i`d be very happy with that, well done

[Ikonnikov]

Thanks for your comments folks, due to my incompetence the image went awol this morning but has now been kindly restored by Grant from admin.

[ultranova]

Its so good some one stole it,  A very nice first narrowband indeed,

And a great target for it ,

well done

Paul

[Ikonnikov]

Thanks for the encouragement, I hope I'll get the time/weather to try out my OIII filter while the Crescent is still nice and high in the sky...

[MartinB]

Lovely Crescent.  It looks like you are managing to tame the hyperstar.  There are no free gifts in astroimaging and imaging at F2 presents a unique set of challenges