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Canada Nature | Star Photography | (Entered Sep. 07, 2010) |
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No doubt you've had it happen to you at least once. You're out in the countryside in the middle of the night, you look up into a perfectly clear sky and see millions of stars. Amazed, you try to take a photograph of this wonder. You point your little digital camera up into the sky and click, but all you get on your LCD is pure blackness. In the photo below you can clearly see the effect of the Earth's rotation, which can be kind of cool if that's the look you're going for. This photo was taken with a shutter speed of 350 seconds, an ISO of 400 and an aperture of f/8 (to keep the image from being too overexposed). Incidently this is also a good way to find Polaris (the North star). Seeing how Polaris is situated almost directly above the north axis point of the Earth's spin, to an Earthbound observer, it seems to stay in the same position relative to the stars around it (which is of course the reason seafarers used it centuries ago to navigate). Polaris is the pinkish tinted star just above center, about a centimeter away from the left border. Oh and if you're wondering why some stars leave blue streaks and some leave orange or yellow, it has to due with factors such as their age, composition and temperature. The youngest, hottest stars are bluish, while the reddish ones mean the star is cooler and/or older. Another interesting point of star photography is that a quality camera can 'see' many more stars than the unaided human eye. With a shutter speed of 64 seconds, an ISO of 800 and an aperture of f/2.8, more and more (previously imperceptible) stars begin to appear. With a shutter speed of 155 seconds, a thick, bright band (the plane of our galaxy), starts to appear (below image), albeit with some unappealing motion blur and graininess. I suppose the next piece of equipment I need (to get tack sharp photographs of the night sky) is some kind of specialized mount that slowly pans across the sky, compensating exactly for the Earth's rotation, but I'm sure something like that would cost crazy amounts of money. If anyone has a better, cheaper solution, I'd love to hear it!
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Star Photography
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