Dark horse Nebula by McKendrickPhotography.com The San Rafael Swell a very scenic portion of central
Dark horse Nebula by McKendrickPhotography.com The San Rafael Swell a very scenic portion of central Utah, with mesas, cliffs, buttes, springs and beautiful canyons. The Swell is an oval shaped uplifted area of layered rocks, geologically termed an anticline. It is about a 75 by 40 mile area, most of which has been eroded away forming the mostly flat central plateau. The strata at the edges are left exposed and angled near vertically and make up the San Rafael Reef. This is where some amazing slot canyons are found, Ranching has been and continues to be the only major use of the land. There are herds of wild horses and burros roaming the area, along with bighorn sheep, mule deer and mountain lions. Most of the roads across the swell result from prospectors in the early to mid twentieth century, and these provided the only access until 1972, when the interstate was constructed, dividing the region in two. Thiss image is the “Dark Horse Nebula” rising over the “Swell”. The foreground was shot at 35 mm, ISO 1600 for 5 min. The night shot is also at 35 mm, 20 sec, ISO 6400, f2.8. I did makr a mistake on this image. I forgot to apply the “500 rule” (exlained below). The stars are a little elongated due to the 20 sec exposure. I should have been at 14 sec or below. The 500 rule for a full frame camera requires you to set your camera to ISO 3200 or 6400, Aperture to f/2.8 (or as wide as possible) and your shutter speed to 500 divided by the focal length of your camera. For example, if you are shooting with a 50mm lens, your shutter speed would be 10 seconds (500 / 50 = 10). This is due to the speed of the Earths rotation. https://flic.kr/p/2jgBjL6 -- source link
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