This image is composed from 3 frames - each frame taken a year apart - a total of 3 years in making!
The project started in 2012 - each year I added another frame and still in 2014 ,I wasn't happy with the outcome.
In May 2015 - I finally was able to add the proper color data.
This is X2 downgrade in the resolution from the original 11677X4046 pixels and still it is a huge image.
At the upper left side on the dark lane you can see the comet P/2015 F1 (Panstarrs) - as imaged on May 20th 2015 at 03:00 UTC.
Each frame is 90 min of luminance, 30 min Ha and 30 min RGB.
The total time is 7.5 hrs for the whole image...
Imaged with the 16" f3.75 Dream Astrograph.
Apogee Alta U-16M camera.
Imaged from Tivoli farm in Namibia from June 2012 till May 2015.