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The blue flash nebula from Thézac (France, dept. 17) on 14/08/2016 Auto-guiding: Orion 80ED refractor at F=1200mm, LodeStar StarLight Xpress Optical equipment: C8 telescope F=2000mm Mount: Skywatcher NEQ6 Goto Imager: Atik 314L+ at -9,5°C Moon: annoying moon Conditions: hot and dry air, 20°C Exposure time: L:12x120s in binning x1, R:6x120s in binning x2, G:7x120s in binning x2, B:7x120s in binning x2 Offsets: 15x0.001 in binning x1, and 15x0.001 in binning x2 Darks: 5x120s in binning x1 and 5x120s in binning x2 (taken in 2013) Flats: L:15x0.04s R:15x0.6s G:15x0.034s B:15x0.018s Ha:15x8s Processing: IRIS then GIMP (curves) Commentary: not very good result, however guiding was quite ok. Annoying moon. I couldn't add the H-alpha layer.
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The blue flash nebula NGC6905 20/07/2012 at Thézac (dept. 17, France)
Telescope: C8 F=1260mm
Guiding: Orion 80ED refractor at F=1200mm
Mount: Skywatcher EQ6 pro
Imager: Atik 314L+ at -15°C
Mount: LodeStar StarLightXpress
Moon: no moon
Conditions: calm, 15°C
Exposures: L:7x3mn R:4x3mn G:3x3mn B:3x3mn Ha:1x3mn
Binning: L:bin1 RGBHa:bin1
Offsets: 15x0,001s
Darks: 6x3mn in bin1
Flats: 15 per filter
Processing: IRIS then GIMP : tresholds, levels, adding H-alpha layer (screen).
Commentary: interesting nebula, extensions are difficult to reveal.
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