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Contains:  M 43, NGC 1982, NGC 1977, NGC 1980, M 42, Great Nebula in Orion, NGC 1976, The star 45Ori, The star ιOri, The star θ2Ori, The star θ1Ori, The star 42Ori
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M42 in monochrome, 


            Henry Kwok
M42 in monochrome

M42 in monochrome

Technical card

Resolution: 1391x1039 job: 418097

RA center: 83.737 degrees

DEC center: -5.469 degrees

Pixel scale: 3.433 arcsec/pixel

Orientation: -100.436 degrees

Field radius: 0.828 degrees

Locations: Home, Auckland, New Zealand


I acquired this image as part of my test for my recently acquired WO GT81 and secondhand Atik 314L+, mounted on my ZEQ25. I took only three subs at 10 seconds, 5 minutes and 10 minutes with no filter while ironing out the mount. I did a quick HDR combine and performed very limited editing since I had the subs anyway to see what I could get. I do not have commercial software to do HDR combine, so I used manual methods with GIMP 2.9. Unfortunately, I cannot find any reference on how to do noise reduction in GIMP 2.9, and I can no longer get the file back into Pixinsight LE for noise reduction - so this is one noisy picture. If you have any tips on how to denoise in GIMP 2.9, please let me know. Overall I am quite happy with the setup. Still need to tweak reducer spacing and mount balance.



Henry Kwok
License: None (All rights reserved)

Sky plot

Sky plot


M42 in monochrome, 


            Henry Kwok