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東方塑 发表于 2007-4-1 11:47

這是 sky new 对skywatcher ed评论员部份意見

Published in SkyNews magazine
By Alan Dyer and Terence Dickinson
Courtesy of SkyNews Magazine

NEW SKY-WATCHER REFRACTORS AND EQUATORIAL MOUNTS
We test two ED refractors and two mounts - all with performance and prices that seem too good to be true.

The first astronomical telescope, the one Galileo built in 1609 and used to observe Jupiter's moons, the crescent of Venus and the rumpled surface of the Moon, was a refractor. Galileo's best telescope had a single one-inch main lens and another lens element for an eyepiece. By the 18th century, refractor makes were using two or more lens components, known collectively as the objective lens, at the front of the tube to improve telescope performance. This design, called an achromatic refractor, is still used in commercial refractors today.

Although achromatic refractors work well, they have what is known as residual false colour-portions of he blue and red components of light are not properly focused by the objective. This produces a purple fringe around the edge of the moon and a ring around bright stars and planets and tints such targets with a pale yellow-green cast. When the telescope is used for photography, this becomes a significant handicap, especially with digital cameras.

However, during the 1970s, the residual false-colour problem was solved with the development of fluorite objective components, which bring all the colours to essentially perfect focus in a telescope shorter than the traditional achromatic refractor. This type of scope is the apochromatic refractor, also know as a fluorite or an ED refractor, which signifies the type of glass utilized.

pangxn 发表于 2007-4-1 13:48

bigfool 发表于 2007-4-1 14:06

怎么是在讲历史呢::0014::

Alone狼 发表于 2007-4-1 14:33

怎麽搞得。。都是歷史。。。。。::0014::

Nbird 发表于 2007-4-1 16:22

……没看明白……::0014::

Y星人 发表于 2007-4-1 16:39

希望同好给翻译一下,::0022::

北斗天璇 发表于 2007-4-1 16:51

是呀．我是新来得，也不太明白，希望翻译．

我爱祖祖 发表于 2007-4-1 17:04

看懂了一些，不是全懂

bigfool 发表于 2007-4-1 17:12

楼主没发全 把望远镜的历史发了一遍::31::

tony_duan 发表于 2007-4-1 17:52

刚找到SYNTA的新网站：www.sky-watcher.net

天天笑笑 发表于 2007-4-2 08:33

小晕一把，怎么在讲望远镜历史（而且还是“古代史“）
后面的呢？

杜卡迪 发表于 2007-4-2 08:46

就是看不懂！::0022::

木习习 发表于 2007-4-2 09:19

我得去补习英语了

天天笑笑 发表于 2007-4-2 09:21

我帮楼主补全。但是英文的::39:: ::39:: ::39::

80ED PRO 不包括赤道仪加拿大售价（美国基本上没有）大约650加币再乘以1.14的税，感觉怎么样::32::::32::

[ 本帖最后由 天天笑笑 于 2007-4-2 09:24 编辑 ]

天天笑笑 发表于 2007-4-2 09:49

这是一朋友用80ED 拍的M13
10 x 180s with SXV M8C, Hutech LPS, SkyWatcher 80ED at f/7.5, EQ6 Pro Mount

[ 本帖最后由 天天笑笑 于 2007-4-2 11:50 编辑 ]

penn 发表于 2007-4-2 10:22

We test two ED refractors and two mounts - all with performance and prices that seem too good to be true.

关键是这句。

成都巽风 发表于 2007-4-2 11:41

原帖由 天天笑笑 于 2007-4-2 09:49 发表
这是一朋友用80ED 拍的M31
10 x 180s with SXV M8C, Hutech LPS, SkyWatcher 80ED at f/7.5, EQ6 Pro Mount

明明是13，干嘛写31呀～

两者差别实在太大了……一个星系，一个球状星团！::0014::

天天笑笑 发表于 2007-4-2 11:49

呵呵， 手误
就像“丰胸“一样::39:: ::39:: ::39::

Alone狼 发表于 2007-4-2 18:55

拍月亮能比較明顯地看出色差的表現。

skysu 发表于 2007-4-7 22:24

以前没听老师话,看不懂

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