This incredible Orion neighbourhood is always fun to image! It has been 3 years since 2018 so I gave it a try again. Unfortunately clouds have been very persistent, only 4 hours of data was captured. Nice to compare with the two previous attempts with the Esprit120 (December 2018) and with the C11 (March 2018)
Orion Horsehead nebula
I’m not utterly thrilled by this result it can certainly better, I need to add additional Luminance data to reduce the noise and increase detail. This was actually more an exercise in combining NEF Nikon D750 color data taken by the C11 with Starizona reducer with monochrome ASI183MM data taken with the Esprit 120. This was done with AstroPixelProcessor 1.071. As you can see it worked wonderful.
The NEF color frames were split along the RGB color channels and combined with the Luminance result using the RGB Combine tool. The luminance noise was still very present as the Gain settings (230) were too high during the ASI183 capture.
There are some artefacts like the obvious magenta colors top left, and the top right cut-off angle: I need to look into these.
The Horsehead Nebula in orion
This is a very familiar sight and thousands of pictures have been taken of this little “seahorse” or horsehead in the sky. Taken with the Celestron C11 on an EQ8 mount, Starizona LF corrector for Schmidt-Cassegrains, a Nikon D750 DSLR modified for extra H-Alfa sensitivity. 22 frames of 300 seconds each are combined in this image