This is the rich region of clusters and nebulosity in the constellation of Gemini, with the Jellyfish Nebula, IC 443 at bottom near the orange star eta Geminorum. IC 443 is a supernova remnant. The larger region of fainter, diffuse nebulosity at left is IC 444. The loose star cluster embedded in it, with the blue star 12 Gem, is Collinder 89. At top right is the bright showpiece open star cluster Messier 35 with its smaller, more distant companion cluster NGC 2158 at lower right from M35. This is a blend of 8 x 5-minute exposures at ISO 800 unfiltered with 6 x 10-minute exposures at ISO 1600 shot through an Optolong L-Enhance dual-band nebula enhancement filter (it lets through only Oxygen III blue-green and Hydrogen-alpha red to really enhance the nebulosity). All exposures with the Canon EOS Ra mirrorless camera through the SharpStar HNT150 Hyperbolic Newtonian Astrograph at f/2.8, from home on a very clear moonless night January 27, 2020. All stacked, aligned and blended in Photoshop 2020.
The Jellyfish Nebula, IC 443, at left near the star Eta Geminorum at left. IC 443 is a supernova remnant. At upper ight is the bright open star cluster Messier 35. The smaller and fainter star cluster below M35 is NGC 2158. M35 is 2500 light years away but NGC 2158 is 16,500 light years away. This is a stack of 10 x 6-minute exposures with the 92mm TMB apo refractor at f4/4 with the Borg 0.85x field flattener/reducer and the filter modified Canon 5D MkII at ISO 800. Taken from New Mexico.
The area of sky around the star cluster Messier 35, at top in Gemini, with the supernova remnant IC 443 below, and the Monkeyhead Nebula, IC 2174, in Orion at bottom. This is with the 200mm Canon lens to frame a binocular field of view, and taken with the filter-modified Canon 5D MkII camera at ISO 800, for a stack of 9 x 2-minute exposures and through the NISI Natural Night filter to help bring out the nebulas. On the iOptron Sky Guider Pro. Taken from home Feb 20, 2020. The modified camera did a better job at recording the red nebulas than the stock 6D MkII did in shots taken the night before for comparison.
