The great globular cluster and galactic nucleus remnant Omega Centauri, NGC 5139, with two galaxies in the field: Centarus A or NGC 5128, the Hamburger Galaxy, at top; and NGC 4945 at right. Ther field simulates a binocular field of view. This is a stack of 4 x 2-minute exposures with the 200mm telephoto at f/2.8 and Canon 5D MkII at ISO 2500.
A widefield view of Orion's Belt and Sword showing the complex of nebulosity in the area. The three Belt stars are at top (L to R): Alnitak, Alnilam and Mintaka, with the dark Horsehead Nebula (B33) below Alnitak. Above Alnitak is the pinkish Flame Nebula, NGC 2024. At bottom are Messiers 42 and 43, making up the Orion Nebula, with the bluish Running Man Nebula above it, aka NGC 1973-5-7. Above it is the star cluster NGC 1981. Messier 78 is just on frame at upper left. Numerous other bits of emission and reflection nebulas populate the field amid a backdrop of faint emission nebulosity. The stars around the Belt belong to the large star cluster Collinder 70. This is a blend of two stacks of images: 15 x 8 minutes through an IDAS NBX dual narrowband filter to bring out the faint nebulosity, and 15 x 4-minutes with no filter for the more natural star colours and colours of the Orion, Flame and Horsehead (IC 434) Nebulas. So a total of 3 hours of exposure time. I did not take shorter exposures for the Orion Nebula core. All were with the William Optics RedCat 51mm astrograph at f/4.9 and filter-modified (by AstroGear) Canon EOS R at ISO 3200 for the filtered shots and ISO 800 for the unfiltered shots. Taken from home January 22, 2023 on a rare clear winter night. Autoguided and dithered with the Lacerta MGEN3 autoguider. No darks or LENR employed. All stacking, alignment and masking in Photoshop. Luminosity masks with Lumenzia helped bring out the nebulosity, as did a mild application of the Nebula FIlter action in the PhotoKemi StarTools Actions set. Noise reduction with RC-Astro Noise XTerminator. The filtered set has had all the stars removed using RC-Astro Star XTerminator, so it contributed just the nebulosity, Stars come from the unfiltered set for tighter stars with more natural colours.
Orion and the Dog Star, Sirius (bottom), in Canis Major. Many red nebulas are also visible in this area of the northern winter Milky Way, such as the Rosette Nebula at upper left, as well as star clusters such as M41 below Sirius. The Orion Nebula, M42, is below the Belt of Orion in Orion’s Sword. This is a stack of 5 x 5 minute exposures at f/2.8 and ISO 800 with the 35mm lens and filter-modified Canon 5D MkII, plus 2 x 2.5-minute exposures at ISO 1600 with the Kenko Softon filter for added star glows. However, haze this night added natural star glows. Taken from Quailway Cottage near Portal, Arizona, December 5, 2015.
