Our cover picture ...
... shows a pollen corona on 3 May 2009 at about 01:30 CET in Radebeul. Because of the low altitude of the Moon, the color spectrum is already shifted towards red. The typical shape („light knots“ at the top, bottom and sides) of the corona is easier to see when the light source is low. A mixture of pollen certainly comes into question as diffracting objects. At the time of the picture, however, eastern European pine pollen was dominant. Image data: Nikon D80, ISO 100, exposure time 13s, Sigma Apo 70 to 300 lens, picture taken at about 85 mm focal length. © Frank Wächter, Radebeul
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