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The Ring nebula M57 from Thézac (dept. 17, France) le 22/08/2016 Guiding: off-axis guider on C8 at F=2000mm, LodeStar StarLight Xpress Telescope: C8 at F=2000mm, Mount: SkyWatcher EQ6 Imager: Atik 314L+ at -9.5°C Moon: 80% Conditions: 14°C, humidity Exposures: L:8x120s bin1 R:6x120s bin2 G:6x120s bin2 B:6x120s bin2 Ha:6x120s bin1 Offsets: 15x0.001s in bin1 and 15x0.001s in bin2 Darks: 5x120s in bin1, 5x120s in bin2 flat L:15x0.06s R:15x0.8s G:15x0.045s B:15x0.023s Ha:5x48s Processing: IRIS then GIMP. Commentary: I finally could use the off-axis guider. I took me more than one hour to find the way to have light in the LodeStar, by adjusting the small screws and the small mirror. Then I focused the Atik, then the LodeStar. I also used PHD2 Guiding software for the first time.
Guiding: Orion 80ED refractor F=1200mm camera LodeStar, PHDGuiding Telescope: C8 at F=1260mm, Mount: SkyWatcher EQ6 Imager: Atik 314L+ at -9.5°C Moon: no moon Conditions: 15°C Exposures: L:3x240s bin1 R:3x240s bin2 G:3x240s bin2 B:53x240s bin2 Offsets: 15x0.001s in bin1 and 15x0.001s in bin2 Darks: 8x240s in bin1, 3x240s in bin2 flat L:15x0.023s R:15x0.37s G:15x0.03s B:15x0.0175s Processing: IRIS then GIMP. Commentary: good guiding, few exposures by lack of time.
The planetary Ring nebula M57 from Thézac (dept. 17, France) 29/07/2014 Guiding: Orion 80ED refractor F=600mm camera LodeStar, PHDGuiding Telescope: C8 at F=2000mm, Mount: SkyWatcher EQ6 Imager: Atik 314L+ at -9.5°C Moon: no moon Conditions: humid air, some clouds, 15°C Exposures: L:5x60s bin1 R:5x60s bin2 G:5x60s bin2 B:5x60s bin2 Ha:6x60s bin2 Offsets: 15x0.001s in bin1 and 15x0.001s in bin2 Darks: 7x60s in bin1 and 7x60s in bin2 flat L:15x0.04s R:15x0.65s G:15x0.04s B:15x0.028s Processing: IRIS then GIMP. Commentary: not enough exposures because of the clouds. I tried to focus for each filter, but I failed. Bad guiding probably because of bad polar alignment.
M57, the Ring nebula 21/08/2012 at Thézac (dept. 17, Fance) Telescope: C8 at F=4000mm Guiding: 80ED refractor F=1800mm with LodeStar StarLight Xpress CCD camera, PHDGuiding software Mount: SkyWatcher NEQ6 Imager: Atik 314L+ at -13°C Moon: no moon Conditions: good night Exposures: L:7x60s in bin2 R:4x60s in bin3 G:4x60s in bin3 B:4x60s in bin3 H-Alpha:8x60s Offsets: 7x0.001 in bin2 and 7x0.001 in bin3 Darks: 3in bin2 and 3 en bin3 Flats: L:7x0.08s R:7x2s G:7x0.02s B:7x0.01s Ha:7x4s IRIS processing: pre-processing, blur GIMP processing: adding H-Alpha layer, then curve of the blue layer. Commentary: happy with this result for this long focal length. 
M57, the Ring nebula 20/08/2010 at Thézac (dept. 17, France) Telescope: C8 at F=1260mm Guiding: 80ED refractor F=600mm with LodeStar StarLight Xpress CCD camera, PHDGuiding software Mount: SkyWatcher NEQ6 Imager: Atik 314L+ at -15°C, binning 1x1 Lune : very annoying Conditions: very humid Exposures: L:2x120s R:2x120s G:2x120s B:2x120s H-Alpha:5x120s Offsets: none Darks: 3x120s IRIS processing: removal of offset and dark, registration and addition of images, the combining LRGB layers GIMP processing: Adding H-Alpha layer, level of black. Commentary: quite good. 
le 19/08/2011 at Thézac (dept. 17, France) Telescope: C8 at F=2000mm Guiding: Orion Short Tube refractor F=800mm with LodeStar StarLight Xpress CCD camera, PHDGuiding software Mount: SkyWatcher NEQ6 Imager: Atik 314L+ at -15°C, binning 1x1 Lune : annoying Conditions: hot night 19°C Exposures: 20x30s LRGB Ha Offsets: 0.1sx15 Darks: 5x30s IRIS processing: removal of offset and dark, registration and addition of images, the combining LRGB layers GIMP processing: Adding H-Alpha layer, level of black. Commentary: none 
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