天阿，我找不到都普森的資料
Dobsonians
我現在只知道，這個是比較新式的望遠鏡
主要產廠是德國的Skywatch
可以在小口徑內做到高焦距，
所以比較可以看到深空天體的面貌
可是
我卻找不太到對他的評價
也沒有他和牛頓式或蓋賽的比較
感覺很虛，
好像是蠻新的東西
一份日本的文件如是說：
http://0rz.net/ae0Xe
「But in the past two decades, as science writer Timothy Ferris points out,
three linked innovations have turned astronomy into an open-source, Pro-Am
activity. 」
「First, there was the disruptive innovation. John Dobson, a onetime monk and
full-time stargazer, built a crude but powerful telescope using inexpensive
materials. Observers armed with their own Dobsonians can now invade deep space
, previously the preserve of the professionals.」
大概的意思是說，這個是最近20年內的天文學突破，
第一個就是都普森，可以讓非專業者輕鬆的看到深空天體
「Then came the CCD, a highly light-sensitive chip that could record very faint
starlight more accurately than a photograph. With Dobsonian telescopes and CCD
sensors, the Earth acquired hundreds of thousands of new eyes, probing space
and recording events that would have gone unnoticed by the few thousand
professionals.」
第二個是CCD
「The Internet multiplied the power of this distributed capacity for
exploration: An amateur who has found something interesting can email the
image to friends, colleagues, and professionals within minutes.」
第三個是Internet, 可以觀測的瞬間把資訊發送給所有的人知道
不過
看一般的牛頓還是蓋賽反射鏡
同口徑的焦距都比較短
反之，
像我們那一台
都普森可以做到1200mm(同口徑8cm的大概只有600mm)
而到20cm左右（像花師那一台）就更難了
看來，應該是同口徑，但是卻能夠長焦到可以看到深空天體
可是有大陸的評論這樣說：
http://0rz.net/b30Wu
說他是低倍率的設計....= =
感覺很兩極....= =
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 61.231.197.156
※ 編輯: jamihan1981 來自: 61.231.197.156 (12/26 02:45)
推
12/26 12:45, , 1F
12/26 12:45, 1F
推
12/26 13:34, , 2F
12/26 13:34, 2F