Hi Markus
I submitted the emission nebula Gum 85 (Sh 2-54) near the open cluster NGC 6604 (and M16 and M17) as a suitable target for imaging by the Gemini South Telescope, and chose to have it imaged in broadband.
The image is a composite of two framings - the GMOS sensor covers 5.5' x 5.5' of the sky. The filters and capture times for each framing were as follows:
3 x 90" with H-alpha filter 654-661 nm, 656 nm effective
3 x 45" with i (infrared) 706-850 nm, 780 nm effective
3 x 90" with u (ultraviolet) 336-385 nm, 350 nm effective
3 x 60" with g (green) 398-552 nm, 475 nm effective
The choice of filters and exposure timings were mutually decided upon by Professor Travis Rector (University of Alaska) and myself. Travis processed the captured fit files, finishing the image in Photoshop.
Here's a link to a larger version of the image, a smaller one of which I use as my avatar.
https://www.aao.gov.au/itso/outreach/GeminiContest
Paul
PS Thank you for your interest in the image.