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NGC 1491(Sh2-206, LBN704) is a nebula in Perseus. I captured it with the same camera position used in Western (and Eastern) Veil, being the second target of the night (for me it is now available after midnight).
Total exposure: 20 hours and 50 minutes (frames of 5 minutes, 149xHa, 51xOIII, 50xSII). The signal is pretty weak on Ha, that's why I took so many frames, so that I can also use it as a luminance. On OIII and SII the signal is very weak, the stacks came out noisy with about 4 hours exposure. Even if I had tripled the exposure, the signal would not have increased too much, I would have only reduced the noise in the background (here the weaker transparency of the sky and the moon light was to blame). I didn't take RGB frames for the stars, I used the ones in the picture Ha.
During processing, I seriously had to pull it by the hair to get what I wanted. The background was just spots of different colors, like an ugly gradient (I also looked at other pictures and that's exactly how the area is). I didn't like it, so I reduced the background saturation and used a gradient reduction software (in addition to DBE from the linear phase).
Setup: newton SW 150/750, ASI1600MMPro, filters Baader 7nm Ha, Astronomik 6nm OIII, Baader 8nm SII
Clear sky!
Sounds like you had to did deep on this one, but you sure pulled out a magnificent final image!
Fabulous color and sharp details. Well done!
Jim
Scopes: Explore Scientific ED102 APO, Sharpstar 61 EDPH II APO, Samyang 135 F2 (still on the Nikon).
Mount: Skywatcher HEQ5 Pro with Rowan Belt Mod
Stuff: ASI EAF Focus Motor (x2), ZWO OAG, ZWO 30 mm Guide Scope, ASI 220mm min, ASI 120mm mini, Stellarview 0.8 FR/FF, Sharpstar 0.8 FR/FF, Mele Overloock 3C.
Camera/Filters/Software: ASI 533 mc pro, ASI 120mm mini, ASI 220mm mini , IDAS LPS D-1, Optolong L-Enhance, ZWO UV/IR Cut, N.I.N.A., Green Swamp Server, PHD2, Adobe Photoshop CC, Pixinsight.
Dog and best bud: Jack
Sky: Bortle 6-7
My Astrobin: https://www.astrobin.com/users/Juno16/
Scope: Skywatcher Evostar 80ED (SW 0.85 FR/FF) on a SW NEQ6Pro
Guiding; SW Evoguide 50ED, ASI 120mm mini
Meade 8" LX200 GPS on wedge (Guided with a cheapo 50mm guidescope and a ZWO ASI 120mm mini)
Sharpstar 61EDPH II (with dedicated 0.8 reducer) with wiliam Optics 32mm uniguide
Camera: ASI2600MC pro. QHY 163M with ZWO 7nm NB filters, Canon EOS700D astro mod
Secondary mount: Skywatcher StarAdventurer
