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File:Circles in Thin Ice, Lake Baikal, Russia.jpg

Summary

Description
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.

Licensing

Public domain 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.)
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 Warnings:
  • Use of NASA logos, insignia and emblems are restricted per US law 14 CFR 1221.
  • The NASA website hosts a large number of images from the Soviet/ Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
  • Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI. See also {{ PD-Hubble}} and {{ Cc-Hubble}}.
  • The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use.
  • Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted.
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Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.
Camera manufacturer NIKON CORPORATION
Camera model NIKON D3
Exposure time 1/1,600 sec (0.000625)
F-number f/5.6
ISO speed rating 400
Date and time of data generation 23:51, 23 April 2009
Lens focal length 400 mm
Orientation Normal
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
Exif version 2.21
Date and time of digitizing 23:51, 23 April 2009
Shutter speed 10.643856
APEX aperture 4.970854
Maximum land aperture 3 APEX (f/2.83)
Metering mode Pattern
Light source Unknown
Flash Flash did not fire
DateTime subseconds 24
DateTimeOriginal subseconds 24
DateTimeDigitized subseconds 24
Colour space sRGB
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
Contrast Normal
Saturation Normal
Sharpness Normal
Subject distance range Unknown

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