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Images Section => Deep Sky Images => Topic started by: Dean on 15:29:41, 19 December, 2017

Title: NGC891
Post by: Dean on 15:29:41, 19 December, 2017
After weeks of no sky in the South West a clear night last night.  NGC891 captured with 29x600s light frames using the 235mm EdgeHD.
All calibration and processing in PI.
Title: Re: NGC891
Post by: psjshep on 21:28:14, 19 December, 2017
An old fave of mine....  nice, Dean :clap:

Phil
Title: Re: NGC891
Post by: Eccoskies on 20:10:00, 20 December, 2017
Very nice Dean. One of my favourites too  :thumbup:
Title: Re: NGC891
Post by: Roger B on 15:49:06, 21 December, 2017
Nicely done,   

Rog
Title: Re: NGC891
Post by: Nimbus on 15:51:31, 21 December, 2017
Nice capture ATB Jim
Title: Re: NGC891
Post by: PaulB on 06:18:41, 22 December, 2017
Nice capture.
But. I can see a gradient that spoils it. Maybe further processing in PI could remove this?
Title: Re: NGC891
Post by: clive on 16:46:38, 22 December, 2017
My favourite galaxie nice image to
Title: Re: NGC891
Post by: Dean on 16:04:15, 02 January, 2018
Thank you for the replies.  There is some light gradient which is actually the product of stacking pre and post meridian flip images.  This has created a gradient that is a bright horizontal band in the centre fading as we move vertically away from the centre in either direction.

Reworked the images by stacking and gradient extraction of the pre-merdian flip and then separately the post meridian flip images.  These were then re-aligned and combined.  This seems to cope with the gradient more effectively. 

Advise and views appreciated on this.
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