alignling optical axis of Vixen polar scope

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gary125
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alignling optical axis of Vixen polar scope

文章 gary125 » 週一 06 6月, 2011 17:49

HI all,

I find that the my GP polar scope is out of collimation to the axis of the mount. refering to the Vixen manual, I can align it myself on the optical axis adjustment screws: ( p. 14 in the attached pdf file)

http://www.vixenamerica.com/Pdf/Mounts/ ... ircles.pdf

do anyone know if A (red) or B ( blue) in my photo are the optical axis adjustment screws? Thanks in advance.
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LT
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文章 LT » 週一 13 6月, 2011 22:39

Gary,

Screw B. There are 3 screws in 120 degrees apart. But I don't think it is necessary to align it if photographic focal length is 800mm or shorter.

Good luck.

LT

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PeterPeter
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文章 PeterPeter » 週二 14 6月, 2011 09:22

不談機械的構造問題,極軸鏡的準確度取決於以下兩點:
(1) 極軸鏡是否同軸
(2) 極軸鏡初始化設定
http://www.hkastroforum.net/viewtopic.p ... c961f90c98

但鮮有見到有本地同好談論具體的操作.

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Wah!!
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文章 Wah!! » 週二 14 6月, 2011 10:52


LT
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文章 LT » 週二 14 6月, 2011 12:21

For those famous brand instruments, the accuracy is very good enough. Just the question, is it so necessary? That is totally up to your requirement.

In fact, for the very precious polar alignment, star drift method is the unique method.

Polarscope just provides us with some certain of convenience. With today autoguiding method/instrument/softwares, I don't think so. Maybe I am too lazy.

But if you step into 2000mm or longer focal length, that will be another precision requirement. But the system flexure may become a bigger problem rather than how to collimate the optical axis of polarscope with the mechanical axis to what degree of level.

Just my 2 cents. Buy or don't buy, just up to you.

LT

PeterPeter 寫:不談機械的構造問題,極軸鏡的準確度取決於以下兩點:
(1) 極軸鏡是否同軸
(2) 極軸鏡初始化設定
http://www.hkastroforum.net/viewtopic.p ... c961f90c98

但鮮有見到有本地同好談論具體的操作.

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PeterPeter
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文章: 2653
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文章 PeterPeter » 週二 14 6月, 2011 13:16

多謝華兄提供的教材.
這遊戲果然好具體,對於熟習極軸鏡的軸心調整極之有用. :D

接下來就要專心地調整極軸鏡初始化設定喔.
有冇師兄知道可以在那裡得到不同牌子及型號的赤道儀極軸鏡初始化設定及其調整步驟呢? :roll:

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