LBN400 - A Portion of Sh2-119

This is my version of Lynds Bright Nebula 400 located 2,200 light-years away from Earth in the constellation Cygnus. LBN 400 is a mere portion of the large emission nebula Sh2-119, often called the Clamshell Nebula due to its resemblance to an open shell. Other Lynds Catalogue of Bright Nebula and Dark Nebula objects are visible in this image. Both Lynds Catalogues were compiled by Astrophysicist Beverly Lynds in the 1960s. I especially like the dark nebulae located on the top right of the image.

After examining the narrowband data, I found there was a ton of detail in the Ha and SII channels but OIII was very limited. I experimented with even combinations which produced less detailed and not so natural looking images, therefore, I did a typical S-curve stretch on the OIII where I reduced the faint background highlighting the areas that did show some detail and then did a normal SHO blend. The overall blend was more natural looking so I went with it as it also preserved the flowing detail.

Higher Quality:
https://www.astrobin.com/ocq4i6/?nc=collection&nce=712

LBN400 - A Portion of Sh2-119  
Dates: 9-14-25, 9-21, 9-22, 9-28, 10-1, 10-3, 10-8, 10-9
Camera: ZWO ASI1600MM-Pro
Telescope: Astro-Tech AT115EDT 115mm Refractor Telescope
Barlow: None
Focal Length: 805mm (644mm w/ FR)
f/7 (f/5.6)
Focal Reducer: 0.8x AstroTech Field Flatterner/Focal Reducer
Mount: Orion Sirius
Filter Wheel: ZWO
EFW 8 x 1.25"
Filter: Antlia Ha, OIII, SII; ZWO R, G, B
Focuser: ZWO EAF
Autoguiding: ASI120 Mini attached to an Agena 50mm Guide Scope/ZWO 60mm Guidescope
Exposure: Ha 53 x 300, OIII 50 x 300, SII 58 x 300 R 47 x 90, G 47 x 90, B 45 x 90 (16h 54m)
Gain: 139
Offset 20
Sensor Temp: 0 C
Processing: NINA, PixInsight, Photoshop, BlurXTerminator, StarXTerminator, NoiseXTerminator, GraXpert, Bill Blanshan Star Reduction, Bill Blanshan Color Masks, Bill Blanshan Stretching, Topaz Denoise.

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