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| Description: Four of the most common optical designs for reflecting telescopes: (a) Newtonian focus (popular among amateur astronomers) and the three major designs used by researchers—(b) Cassegrain focus, (c) Nasmyth focus or coudé focus, and (d) prime focus. Picture Stats: Views: 733 Filesize: 271.05kB Height: 900 Width: 1025 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=15872 |