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| 21.03.2012 22:00 Mars shot by M. Grünanger and A. Kreutzer with webcam ScopiumCam (Sony ICX0988Q CCD, 640x480pixel, 5.6x5.6my, 30Images/sec) through the Alvan Clark refractor of the University of Vienna, D=300mm/f=5000mm extended to 10000mm with a Barlow lens, yellowfilter to reduce strong cromatic distortion of the refractor. The image was made by a superposition of 1800 video frames |
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