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07/12/2006 01:42:05 PM · #1 |
LINK TO PHOTO
I was emailed this photo, and I'm wondering what you think of it. How did they get such a nice exposure without noticeable star trails?
And how do those rocks MOVE
Message edited by HBunch - REMOVED LARGE IMAGE PER FORUM RULES. |
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07/12/2006 02:16:19 PM · #2 |
My guess:
it says "huge desert stones" - notice the size of that stone...it looks tiny. This is because the photog was most likely using a very wide angle lens.
Wide angle lenses typically need much longer shutter speeds to show star trails as opposed to telephoto lenses. They were able to get the nice long exposure with no star trails due to the wide angle of the lens.
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07/12/2006 02:38:25 PM · #3 |
Plexxoid. I have removed the large image per the forum rules that state...
Please do not post large images directly to the forums. When posting images to the forums, be aware that some readers access the site via dial-up, and that in some countries, Internet access is charged per KB downloaded. With this in mind, images larger than about 30K, or more than 500 pixels in either dimension, should be posted as links or thumbnails.
Please review the FORUM RULES. Thanks.
Message edited by author 2006-07-12 14:39:27. |
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07/12/2006 02:43:47 PM · #4 |
| This article explains the phenomenon...and yes, some of the rocks ARE huge...like 700 pounds huge. :) |
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07/12/2006 02:47:29 PM · #5 |
I think the best explanation is that when the Racetrack gets wet, it turns to clay-like mud. Strong winds then blow the rocks around on the slick surface. It's definitely not that the rocks are moving downhill, some of them even go uphill!
I was there a couple of months ago. It's quite a drive on a gravel road to get to the Racetrack, but well worth it.
Here's a link to the U.S. Geological Survey website about the Racetrack:
//geology.wr.usgs.gov/parks/deva/ftrac1.html
Message edited by author 2006-07-12 14:56:04.
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