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Sun Halo by Christopher Davis

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About This Gigapan

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Taken by
Christopher Davis Christopher Davis
Explore score
1
Size
0.16 Gigapixels
Views
847
Date added
Nov 10, 2011
Date taken
May 04, 2011
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Description

This is a natural occurence but occurs here west of the mountains in Monte Alegre more often due to the atmospheric conditions. Halos form when moisture enters high in the atmosphere forming ice crystals, the orientation of the crystals bend light at angles that produce either 33° or 66° arcs. I think this is a 33° sun halo but I could be wrong. This occurred shortly after noon so the sun halo was practically directly overhead. The halo is too big to capture in a single photo and usually pictures of sun halos use a structure to block out the sun. The gigapan here provided me the opportunity to capture an entire sun halo in a single image without blocking out the sun. The only problem is, to calibrate the gigapan I usually use a horizontal line, here with the open sky, I had no clear marker to use for aligning the image, so when stitching, it grouped the images into three separate images. Luckily the center image captured the entire sun halo, fully stitched


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Stitcher Notes

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GigaPan Stitch version 1.1.1565 (Macintosh)
Panorama size: 155 megapixels (23344 x 6640 pixels)
Input images: 12 (3 columns by 4 rows)
Field of view: 274.3 degrees wide by 78.0 degrees high (top=47.5, bottom=-30.6)
Settings:
Vignette correction on: c1=-0.0649 c2=-0.000984
All default settings
Original image properties:
Camera make: Canon
Camera model: Canon PowerShot SX110 IS
Image size: 3456x2592 (9.0 megapixels)
Capture time: 2011-05-04 14:46:51 - 2011-05-04 14:47:52
Aperture: f/8
Exposure time: 0.0008
ISO: 80
Focal length (35mm equiv.): 35.8 mm
Digital zoom: off
White balance: Automatic
Exposure mode: Manual
Vertical overlap: 44.8 to 49.1 percent
Computer stats: 2048 MB RAM, 2 CPUs
Total time 2:19 (12 seconds per picture)
Alignment: 11 seconds, Projection: 9.7 seconds, Blending: 1:59
(Preview finished in 31 seconds)

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