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needweed

26 Mai 2013 12:06



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9.6% by area or 39.4mm (1.55 inches), 
31% by diameter   :!:   nu e tot una


Oglinda principala :  127mm =  12667 mm²
Oglinda secundara: 39.4mm=     1219 mm²
12667 - 9.63% = 1219


http://www.astronomyhouston.org/sites/default/files/telescopes/IMAG0226.jpg