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Summer Milky Way outside of Ridgway, Colorado
This scene is all natural light. The light on the land is that from the night sky: light from stars, the Milky Way galaxy, and airglow: light from molecules in Earth's upper atmosphere excited by solar ultraviolet light during the day and from cosmic rays. The molecules emit light throughout the night. The red is typically from hydroxyl (OH) 80 to 90 km high. Green is from oxygen emitting at 557.7 nm. Canon 6D digital camera, Sigma 35 mm f/1.4 lens at f/1.4. Thirty one exposures at ISO 1600 were made for the mosaic. On the sky, the camera tracked the stars using an Ioptron, with 19 exposures, 30 seconds each, then 12 images with 120-second exposures of the land were made with no tracking, with ISO 1600. On the land, 4 views were images and three 120-second exposures were averaged in each pointing, thus the four images of the land had 6 minutes of exposure each. The full sized image is 8129 pixels high by 7848 pixels wide (64 megapixels). More info at http://www.clarkvision.com/galleries/ga ... n8x8s.html Roger |
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by crw816
on Wed Aug 13, 2014 8:02 am
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by rnclark
on Wed Aug 13, 2014 8:53 am
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by E.J. Peiker
on Wed Aug 13, 2014 9:46 am
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by CactusD
on Wed Aug 13, 2014 10:23 am
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by Peter Ireland
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by rnclark
on Wed Aug 13, 2014 6:12 pm
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by John Labrenz
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by crw816
on Thu Aug 14, 2014 7:48 am
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by rnclark
on Thu Aug 14, 2014 9:15 am
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by crw816
on Thu Aug 14, 2014 9:26 am
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by Kim
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by rnclark
on Thu Aug 14, 2014 10:57 pm
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by Kim
on Fri Aug 15, 2014 12:48 am
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by Missy Mandel
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by Wade Thorson
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by rnclark
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17 posts | | Page 1 of 1 |