A closeup of the Small Sagittarius Starcloud, aka Messier 24, at bottom, with the field extending north to include the nebulas M17, the Swan Nebula, and M16 at top, the Eagle Nebula. Between M17 and M24 is the small star cluster M18. Patches of red and blue nebulosity at bottom are IC 1283 and the blue reflection nebulas NGC 6589 and 6590. The prominent dark nebula at the right edge of the Starcloud is Barnard 92 with its lone star embedded in it, with smaller B93 above it. My framing was just a little too far west to properly include the M25 star cluster at lower left. This is a stack of 12 exposures, of 4- and 8-minutes with the William Optics RedCat 51mm astrograph at f/5 and the Canon EOS Ra at ISO 800. Aligned, stacked and mean combined in Photoshop. Taken on a perfect night from home on August 15, 2020 with this area just above my treetops. Autoguided with the ZWO ASIAir and ASI120MM guide camera with the RedCat on the Astro-Physics Mach1 mount. No filters employed here. I shot frames with and without Long Exposure Noise Reduction to test the difference on this warm summer night but saw little difference. But then again, thermal noise specks would be lost in the stars here! But LENR was not needed in this case.
M25 open cluster. Taken with 4in Astro-Physics refractor at f/6 with field flattener and Hutech-modified Canon 5D camera at ISO 800 for stack of 4 x 6 minute exposures. Taken from Coonabarabran, NSW, April 23, 2007.
Messier 25, a bright star cluster in Sagittarius, shot from home on a very clear night, August 4, 2019, with the object low in the south. This is a stack of 6 x 8-minute exposures with the Astro-Physics Traveler 105mm apo refractor at f/6 and Canon 6D MkII at ISO 800. I used the AP 6x7 field flattener here. LENR darks subtracted in camera. Diffraction spikes added for artistic effect with Astronomy Tools actions.
