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- 週一 07 7月, 2003 17:09
- 版面: 自製天文望遠鏡 Amateur Telescope Making
- 主題: 終於可以理番塊 gregorian 主鏡.
- 回覆: 33
- 觀看: 21775
格雷果裡式? 有咩好處...... The advantage of Gregorian is that it provides an upright image. So it is often used for terrestrial observation. 1) Newtonian has a parabolic primary. 2) Classical Cassegrain has a parabolic primary and a hyperbolic secondary. 3) Gregorian has a parabolic primary and an elliptica...
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