多大口径的望远镜可以看见卡西尼缝？？？？？
多大口径的望远镜可以看见卡西尼缝？？？？？ 150mm/1200mm ref - 6mmUO ortho=200x �- seen almost 100% around best view150mm/1200mm ref - 10mm Radian=120x �- easy view but not enough contrast
125mm/1350mm sct - 7mmUO ortho=190x �- seen nearly 100% except where disk in front
125mm/1350mm sct - 9mmUO ortho=150x �- sharpest 5� view seen about 70% around
90mm/500mm ref - 7mmUO in 2xTV=140x �- distinct about 50% more-so following edge
90mm/500mm ref - 5mmUO ortho=100x �- good contrast, Cassini 30-40%, low limit 90mm
90mm/500mm ref - 6mmUO ortho=80x �- Cassini only suspected
85mm/600mm apo - 5mmUO ortho=120x �- seen except in front and back about 60%
85mm/600mm apo - 6mmUO ortho=100x �- long arcs seen 40-50% around
85mm/600mm apo - 7mmUO ortho= 85x �- long arcs constant at both ansae low limit 85mm
85mm/600mm apo - 8mmTV plossl= 75x �- only glimpsed long arcs at ansae
78mm/480mm ref - 7mmUO in 2xUltima=140x �- difficult view but seen
78mm/480mm ref - 4mmUO ortho=120x �- barely seen maybe 30%, low limit 78mm
78mm/480mm ref - 5mmUO ortho=100x �- only momentarily suspected on following ansae
76mm/600mm newtcas - 5mmCel Vix ortho=120x �- rings very distinct, but No Cassini
76mm/600mm newtcas � 8mmTV x2Vix = 150x �- rings wide, 2 moons, but No Cassini
60mm/415mm ref - 5mmCel Vix ortho = 83x �- nice view of rings, but No Cassini
80eq就能看到了 整的好 饿呢嫩 80或90EQ 200mm以上看卡缝才不勉强 xhlzwlbh 发表于 2012-6-28 15:47 static/image/common/back.gif
好东西，哪里来的
就在牧夫上找的 看不懂y文啊 80DS可以吗 在国外50甚至40就可以看到 http://product.dangdang.com/product.aspx?product_id=20382150请参考《剑桥天文爱好者指南》这本书
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