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Telescope Calculator
(http://s2.largeimagehost.com/TN/etcQXsQ/tn_simulator.JPG) (http://s2.largeimagehost.com/img/untilted/etcQXsU/simulator.JPG.html)
http://www.telescope-simulator.com/index.php?option=com_content&view=article&id=45&Itemid=57 (http://www.telescope-simulator.com/index.php?option=com_content&view=article&id=45&Itemid=57)
Telescope Comparison:
(http://s2.largeimagehost.com/TN/etcQXsF/tn_comparison.JPG) (http://s2.largeimagehost.com/img/untilted/etcQXht/comparison.JPG.html)
http://www.telescope-simulator.com/index.php?option=com_content&view=article&id=46&Itemid=58 (http://www.telescope-simulator.com/index.php?option=com_content&view=article&id=46&Itemid=58)