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Contains:  41 the01 Ori, 42 c Ori, 43 the02 Ori, 44 iot Ori, 45 Ori, De Mairan's nebula, Great Nebula in Orion, Hatysa, M 42, M 43, M43, NGC 1973, NGC 1975, NGC 1976, NGC 1977, NGC 1980, NGC 1981, NGC 1982, NGC1973, NGC1975, NGC1977, NGC1980, NGC1981, Sh2-279, Sh2-281, The star 42Ori, The star 45Ori, The star θ1Ori, The star θ2Ori, The star ιOri, VdB42, VdB44
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M42 from Bartlett Lake, AZ (Reprocessed), 


            Arun H.
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M42 from Bartlett Lake, AZ (Reprocessed)

Technical card

Imaging telescope or lens:Canon 400mm f5.6L

Imaging camera:Canon 7d mark II

Mount:Fornax Mounts Lightrack II

Dates:Dec. 26, 2018

10x10" ISO1600
38x120" ISO1600
10x15" ISO1600

Integration: 1.3 hours

Avg. Moon age: 19.01 days

Avg. Moon phase: 80.95%

Bortle Dark-Sky Scale: 2.00 job: 3207744

RA center: 5h 35' 38"

DEC center: -5° 16' 47"

Pixel scale: 2.167 arcsec/pixel

Orientation: -62.892 degrees

Field radius: 1.835 degrees

Resolution: 3495x4996

Data source: Traveller


This is a reprocess of my earlier M42 image taken from Bartlett Lake in AZ. The diffraction spikes are from stopping the lens down to f/7.1.

This image shows the true power of imaging at a dark sky site. Taken with a portable tracker and a stock DSLR, it handily shows more detail in the reflection nebula than the image I took from my Bortle 6 backyard with a light pollution filter - a 1.3 hour integration using a camera lens at f/7.1 outperforms a 3.4 hour integration using a cooled monochrome camera with filter wheel and an 80mm f/6 triplet! Dark skies are amazing!!

Link to earlier version:
Link to image taken from Wisconsin:



Arun H.
License: None (All rights reserved)

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M42 from Bartlett Lake, AZ (Reprocessed), 


            Arun H.