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Technical card

Imaging telescope or lens: Canon EF 70-200mm f2.8 L

Imaging camera: Canon 5D Mark II


Software: PixInsightO'Telescope BackyardEOS

Resolution: 5634x3753 job: 229938

RA center: 191.391 degrees

DEC center: -62.489 degrees

Pixel scale: 9.658 arcsec/pixel

Orientation: 94.313 degrees

Field radius: 9.080 degrees


The Coalsack dark nebula in Crux is an apparently massive and dense complex of dust and gas visible only in the Southern Hemisphere. It's a mind-blowing sight to see in dark skies, and appears as a gaping hole in the Milky Way, bordered closely by the beautiful constellation of Crux, or the Southern Cross.

Captured on a recent astrophotography trip 2014-03-30 in the Karoo Desert of South Africa, near the small town of Sutherland.

Image details:
14x5min ISO800
Canon 5D Mark II, unmodified
Canon 70-200mm f/2.8 lens (at f/3.2 135mm)
Celestron CG5-ASGT, unguided
Calibrated with dark, flat, and bias frames

Data acquired with BackyardEOS
Calibrated, aligned, and integrated with PIxInsight
Post-processed with PixInsight and Lightroom



Cory Schmitz

Sky plot

Sky plot


Southern Cross and the Coalsack Dark Nebula, Cory Schmitz

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O'Telescope BackyardEOS