This is the rich nebulosity in Cygnus captured in the narrow red light of hydrogen-alpha emission and rendered as a monochrome image. At lower left is the North America Nebula region, NGC 7000, and at upper right is the complex around Gamma Cygni, called IC 1318. At far right is the Crescent Nebula, NGC 6888. The bright star Deneb is left of centre, though dimmed somewhat as this is a blue star and so appears less prominent in red light. This is with the Canon 135mm L-series telephoto lens wide open at f/2 and with the red sensitive Canon EOS Ra camera, for a stack of 11 x 4-minute tracked but unguided exposures at ISO 3200, so fairly long and at a high ISO despite the fast aperture, due to the dense filter. The filter is the 12nm clip-in Astronomik H-Alpha. Processing was in part using luminosity masks created by Lumenzia extension panel in Photoshop. This was on June 9-10, 2020 with the sky lit by moonlight from the low waning gibbous Moon and by perpetual twilight, though the Milky Way was visible.
A portrait of emission nebulas and dark dust lanes in Cygnus around Deneb, including the North America Nebula NGC 7000 at upper left and the Gamma Cygni or Butterfly Nebula IC 1318 at lower right. I shot this with a waxing quarter Moon in the sky on November 21, 2020, using the red-sensitive Canon EOS Ra equipped with a clip-in Astronomik 12nm H-a filter to isolate just the deep red Hydrogen-alpha emission line, but resulting in a monochromatic image. This is a stack of 24 x 3-minutes at ISO 3200 with the 135mm Canon lens wide open at f/2. Star images toward the bottom are aberrated, I think due to the filter being slightly tipped in the camera body. For artistic effect I added a mild Orton Glow with Luminar 4 and then a blue tint and frame with Nik Collection SilverEFX Pro filter. Some of the tonal stretching was done with luminosity masks created with Lumenzia.
The main complex of nebulosity in Cygnus, taken with a telephoto lens taking in a wide field of 15° by 10°. At left is the brightest nebula in the region, NGC 7000, or the North America Nebula, left of the bright blue star Deneb. Between Deneb and the North America is the Pelican Nebula, IC 5067. At bottom right is the complex around Gamma Cygni catalogued as IC 1318. But there are lots of other arcs and patches of nebulosity here, such as Sharpless 2-119 at far left and Sharpless 2-115 at top. The small Crescent Nebula, NGC 6888, is just in frame at lower right. The star cluster NGC 6866 is at the right edge of the frame. The dark nebula known as the Northern Coalsack is at centre below Deneb. The yellowish region above and to the left of IC 1318 seems to be the little star clusters Bica 1 and 2. The colourful triple star Omicon Cygni is at upper right. This is a blend of filtered and unfiltered stacks: 10 x 2 minutes at ISO 800 with no filter, and 6 x 2 minutes at ISO 1250 with a NISI Natural Night filter on the lens, the Canon EF135mm at f/2.8 on the Canon Ra camera, all on the Star Adventurer GTi mount/tracker (tracked but unguided) and taken as part of testing the mount on its first night under the stars. Taken from home on a very clear night Sept. 20, 2022. Nebulosity brought out with luminosity masks created with the Lumenzia panel for Photoshop and a mild application of the Nebula Filter action from the PK action set for Photoshop. Dew on the filter prevented me from using more filtered frames taken at the end of the shoot.
