File:Circles in Thin Ice, Lake Baikal, Russia.jpg
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|DescriptionCircles in Thin Ice, Lake Baikal, Russia.jpg||
English: This image, a detailed astronaut photograph, shows a circle of thin ice (dark in colour, with a diameter of about 4.4 kilometers); this is the focal point for ice break up in the very southern end of the lake.
|Date||20 April 2009|
|Source||NASA Earth Observatory|
|Author||Image provided by the ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Centre.|
This image was taken with a Nikon 2DXs digital camera fitted with a 400mm lens.
|Public domainPublic domainfalse|
|This file is in the public domain because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)||
|Camera manufacturer||NIKON CORPORATION|
|Camera model||NIKON D3|
|Exposure time||1/1,600 sec (0.000625)|
|ISO speed rating||400|
|Date and time of data generation||23:51, 23 April 2009|
|Lens focal length||400 mm|
|Horizontal resolution||240 dpi|
|Vertical resolution||240 dpi|
|Software used||Adobe Photoshop CS4 Macintosh|
|File change date and time||11:32, 22 May 2009|
|Exposure Program||Aperture priority|
|Date and time of digitizing||23:51, 23 April 2009|
|Maximum land aperture||3 APEX (f/2.83)|
|Flash||Flash did not fire|
|Sensing method||One-chip colour area sensor|
|Custom image processing||Normal process|
|Exposure mode||Auto exposure|
|White balance||Auto white balance|
|Digital zoom ratio||1|
|Focal length in 35 mm film||400 mm|
|Scene capture type||Standard|
|Subject distance range||Unknown|
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