ClarkVision Photography: Mosaic Gallery

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image serengeti.nightscape.c02.21.2015.IMG_0526-46_d-c2_1400b.jpg is Copyrighted by Roger N. Clark, www.clarkvision.com

Night on the Serengeti, Tanzania

Night in the central Serengeti early one February morning. The light in this scene is all natural light from the night sky.

Photographing at night on the Serengeti is very dangerous. Predators, in particular big cats hunt at night. My group has had leopard encounters at night on this and on previous trips. For safety, we hired local staff to stand guard and watch our backs while we made our images. It is still difficult as we want no lights on during the imaging session.

The yellow and red light in the night sky is from 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, and the green is from oxygen around 95 km high, and the two combined give yellow. The morning was slightly hazy creating the diffuse glow around the brighter stars, which also enhances their color. For more on natural color in the night sky see Parts 2a, 2b, 2c and 2d on Color of the Night Sky and proper post processing to show those colors.

The image shows the southern Milky Way. Scorpio is at the left edge and Centaurus is centered, with the Southern Cross above the 3 trees at lower center.

Technical. This image is a 21-frame mosaic. Canon 6D 20-megapixel digital camera, Sigma 35 mm f/1.4 DG HSM lens at f/1.4. twenty-one exposures at ISO 1600 were made, each a 30 second exposure. Exposure of the stars were tracked using an iOptron SkyTracker. Full resolution image is 10,085 x 6,723 pixels (68 megapixels) The field of view is 108 x 72 degrees.


Higher resolution crop, equivalent to the view about what would be seen in a 47 x 70 inch print. The camera tracked the sky, which kept the stars round in the 30-second exposures. The land and trees remain sharp because the slight blur is not noticeable to the same degree star trailing would be visible if the camera were static.

No dark frame subtraction, and no flat fields were used. The Canon 6D has the very low pattern noise, and on-sensor dark current suppression, so there is no need to do dark frames. Modern raw converters correct for hot pixels and, with lens profiles, correct for light fall-off, so there is no need for flat field corrections. Processing was done with 16-bits/channel.

To learn how to obtain stunning images like this, please visit my Extensive Articles on Photography .

Keywords to this image = nightscapes landscape-1 astrophoto-1 mosaic africa africa_2015 serengeti night low-light digital_astro large_format canon_6d

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Last updated September 05, 2024