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Contains:  Great Nebula in Orion, M 42, M 43, NGC 1973, NGC 1975, NGC 1976, NGC 1977, NGC 1980, NGC 1981, NGC 1982, The star 42Ori, The star 45Ori, The star θ1Ori, The star θ2Ori, The star ιOri
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M42 2020

Technical card

Imaging telescope or lens:Takahashi TOA 150

Imaging cameras:Fujifilm GFX-50RPentax 645z Mod

Mount:Takahashi EM-400 Temma2

Guiding telescope or lens:SharpStar 50 ED

Guiding camera:ZWO ASI290MM Mini

Focal reducer:Takahashi TOA 67 Flattener

Software:Photoshop CCAuriga Imaging RegiStarPixInsightStarnet++ Starnet ++

Dates:Jan. 31, 2020

60x120" ISO800
28x20" ISO800

Integration: 2.2 hours

Avg. Moon age: 5.97 days

Avg. Moon phase: 35.23%

Bortle Dark-Sky Scale: 2.00

Basic astrometry details job: 3235959

RA center: 5h 35' 3"

DEC center: -5° 17' 6"

Pixel scale: 1.494 arcsec/pixel

Orientation: 354.975 degrees

Field radius: 1.394 degrees

Resolution: 4000x5400

Locations: Mt. Shiao-Shuei (Taiwan), Taichung, Taiwan

Data source: Traveller


This image was taken as a test to my new camera, so the imaging strategy isn't optimized for obtaining the best quality. Half of the exposures were made with GFX-50R while the other half by 645z.

If you are interested in direct comparison of the images from the two cameras, here you go:
The images are processed in consistent ways to my taste. 645z (modified) is clearly less noisy (reasons unknown yet), but the H-alpha sensitivity of the unmodified 50R is very impressive.



Wei-Hao Wang
License: None (All rights reserved)

Sky plot

Sky plot


M42 2020, 


            Wei-Hao Wang