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The double cluster up and close. This is almost as it's framed by my camera. Only stacking edges were trimmed. Imaged during a full moon on December 4. Details: Scope: SW 150PDS (750 mm fl) on a SW AZ EQ6, unguided Camera: ZWO ASI174MM-cool at -30 C and gain = 0 R: 55 x 30 s G: 54 x 30 s B: 62 x 30 s (Total integration time: 85 minutes) Processed in PixInsight. The Double Cluster consists mostly of blue-white super giant stars. The older red stars looked unnatural when I tried to use more colour saturation, so I kept processing to a minimum. No star reduction, but deconvolution to make the stars "pop" a little more. (click to enlarge)
The full Harvest Moon was so bright that the sky wasn't dark enough to capture galaxies and nebulae so the best option on the first clear night for weeks was to return to this old favourite. The previous attempt at imaging this cluster was done with a 400mm lens and the result was pretty good but I wanted to see how the 150mm Newtonian handled it and I quite like how so many of the fainter stars came out. However it always looks much prettier through the eyepiece. 32 x 75 second exposures at 400 ISO (40 minutes integration time). 64 x dark frames 31 x flat frames 21 x bias/offset frames (subtracted from flat frames only) Captured with APT Guided with PHD2 Processed in Nebulosity and Photoshop Equipment: Sky-Watcher Explorer-150PDS Skywatcher EQ5 Mount Orion 50mm Mini Guide Scope ZWO ASI120 MC imaging and guiding camera Canon 700D DSLR