Thank you every body.
My setup is written below each message !!! TSA 120 & ATIK 314L+ with Ha 7nm.
The exposure is 8 x 900s each night during 2 hours and there is 9 nights = 18 hours.
Franck
Top work. Seamless stitching of panels, very well done. I like how you've left the outlier panel edges and not crop the scene. Adds to the impact. Thanks for sharing.