Sunspot in camera obscura
Taken by Tomas Trzicky on January 10, 2014 @ Prague, EU
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  Camera Used: PENTAX PENTAX K-5
Exposure Time: 1/100
Aperture: f/4.5
ISO: 400
Date Taken: 2014:01:10 10:49:13
  
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Details:
Sunspot group 1944 is so huge that it can not only be seen without optical aid, but even projected by a pinhole or - as in this example by a "camera obscura" effect created by tiny openings in window blinds.
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