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By Jeff Stys
July 14th, 2013
The Grand Prismatic Spring in Yellowstone National Park is the largest hot spring in the United States, and the third largest in the world.
The vivid colors in the spring are the result of pigmented bacteria in the microbial mats that grow around the edges of the mineral-rich water. The bacteria produce colors ranging from green to red; the amount of color in the microbial mats depends on the ratio of chlorophyll to carotenoids and on the temperature of the water which favors one bacterium over another. In the summer, the mats tend to be orange and red, whereas in the winter the mats are usually dark green. The center of the pool is sterile due to extreme heat.
The deep blue color of the water in the center of the pool results from the intrinsic blue color of water, itself the result of water's selective absorption of red wavelengths of visible light. Though this effect is responsible for making all large bodies of water blue, it is particularly intense in Grand Prismatic Spring because of the high purity and depth of the water in the middle of the spring.
The spring is approximately 250 by 300 feet (80 by 90 m) in size and is 160 feet (50 m) deep. The spring discharges an estimated 560 US gallons (2,100 L) of 160 F (70 C) water per minute.
Circular polarizing filter. Adobe Camera Raw.
Nikon D700, Carl Zeiss Distagon T* 2,8/21 ZF.2.
Photo Settings: 21mm, f/11, 1/125 second, ISO 200.
Map: 44.5251, -110.8381
By Jordan M.
July 4th, 2013
A very nice security guard gentleman saw me taking nighttime photos on the street and told me I could go up with him to the roof as the view is great!
I first took this photo and then I took about fifteen others to make a giant panorama of the skyline, but after trying to splice them together, I realized I didn't like any configuration of them. But I liked the FIRST photo I took just as it was! haha!!
Shot tripod-mounted. Single RAW image edited in LR5.
Photo Settings: 50mm, f/9, 30 seconds, ISO 160.
July 3rd, 2013
By Robert Bynum
July 2nd, 2013