向高手们请教C8光轴调整！
我想请教一下，C8调光轴的问题：如果看到衍射圈不是同心圆，请问如何调整：是先调整厚的一端还是先薄的一端？或者同时调整？厚的一端应该松还是紧螺丝？同理我就可以知道薄的一端如何处理了。::0020:: 偶没有明白，啥叫厚，啥叫薄……
最近处于迷糊中！ 哈哈，还有的同好说“肥瘦”呢。
应该这样表述不知道对否：同心圆偏向的一边称为“薄”，远离的一边称为“厚”::34:: 明白了……
如果是偏向一边的话，比如“瘦”的一边，应该松开“肥”的那边的螺丝，然后拧入“瘦”的这边的螺丝。
应该是这样……其实偶这里的天气很少能看出衍射环……能有太阳，偶们就已经满足了……嘎嘎。不过应该和准直光管一样的调整办法的滴～～ 我明白了。如果厚的那一边对应的是两个螺丝，就要同时松开这两个是吧？ 可以，不过每次不要松太多了～一颗可以多一点，一颗少一点。
因为一般情况下，偏的方向，不一定刚好有两个螺丝的。具体松哪颗，需要慢慢积累实际操作经验，多练习几次就熟悉了。
偶发现这个，一两句话还真说不清楚是往那边偏～
可以看看湖州写的这个 http://www.astron.sh.cn/cgi-bin/topic.cgi?forum=2&topic=7717&show=50
调整方式，大致是一样的。 问这么多，其实动手一试就明白了，只要螺丝幅度不要过大，都没问题，可以转半圈的幅度试试 由于用SCT大多数情况下有天顶镜，所以左右是反的。
在有天顶镜时，比如你发现目镜圆心偏向8：00 方向，那么从目镜向改正镜的方向看(延镜桶向前看)，应拧紧4：00 方向的螺丝，或放松10：00方向。 用手在鏡前擋一下就知道方向.
使星點向"粗"的方向移動, 最後就能調好光軸. ;) 调光轴的时候，你得用电跟的，不能放在经纬台上。 原帖由 美丽的天文 于 2007-4-3 16:56 发表
问这么多，其实动手一试就明白了，只要螺丝幅度不要过大，都没问题，可以转半圈的幅度试试
你说得很对，可是我动了好几次手，不管怎么弄都是越来越差，所以到最后也没搞清楚是应该紧还是应该松。所以上来问问么 原帖由 dingye 于 2007-4-4 07:42 发表
调光轴的时候，你得用电跟的，不能放在经纬台上。
或用北极星 一句话，紧瘦的那边。
你也可以这样，
1。把散焦的星象在视场中到处移动，移动到成为同心圆。
2。这时候，你会发现它不在视场中央，然后调副镜螺丝（一调螺丝像就会动），把像调会到中央。
重复1、2。你会发现它成为同心圆的时候，越来越接近视场中心。当调到正好在视场中心的时候，大功告成。 呵呵，不错的好办法阿::28:: 你可以松紧那边试试嘛，松如果偏心恶化，就紧嘛，几次一练，你就成高手啦::35:: ::25:: 建议买这个东东，对调光轴有帮助：
http://www.astronomics.com/main/product.asp/catalog_name/Astronomics/category_name/7KNU5BBG60WE8LQ67W7UG99532/product_id/BKC8 在celestron的网站找到如下一段调节光轴的介绍。祖兄给翻译一下吧
To make collimation a simple procedure, follow these easy steps:
1. While looking through a medium to high power eyepiece, de-focus a bright star until a ring pattern with a dark shadow
appears (see figure 8-2). Center the de-focused star and notice in which direction the central shadow is skewed.
2. Place your finger along the edge of the front cell of the telescope (be careful not to touch the corrector plate), pointing
towards the collimation screws. The shadow of your finger should be visible when looking into the eyepiece. Rotate
your finger around the tube edge until its shadow is seen closest to the narrowest portion of the rings (i.e. the same
direction in which the central shadow is skewed).
3. Locate the collimation screw closest to where your finger is positioned. This will be the collimation screw you will
need to adjust first. (If your finger is positioned exactly between two of the collimation screws, then you will need to
adjust the screw opposite where your finger is located).
4. Use the hand control buttons to move the de-focused star image to the edge of the field of view, in the same direction
that the central obstruction of the star image is skewed.
5. While looking through the eyepiece, use an Allen wrench to turn the collimation screw you located in step 2 and 3.
Usually a tenth of a turn is enough to notice a change in collimation. If the star image moves out of the field of view in
the direction that the central shadow is skewed, than you are turning the
collimation screw the wrong way. Turn the screw in the opposite direction, so that
the star image is moving towards the center of the field of view.
6. If while turning you notice that the screws get very loose, then simply tighten the
other two screws by the same amount. Conversely, if the collimation screw gets
too tight, then loosen the other two screws by the same amount.
7. Once the star image is in the center of the field of view, check to see if the rings are
concentric. If the central obstruction is still skewed in the same direction, then
continue turning the screw(s) in the same direction. If you find that the ring pattern
is skewed in a different direction, than simply repeat steps 2 through 6 as described
above for the new direction.
Perfect collimation will yield a star image very symmetrical just inside and outside of focus.
In addition, perfect collimation delivers the optimal optical performance specifications that
your telescope is built to achieve.
If seeing (i.e., air steadiness) is turbulent, collimation is difficult to judge. Wait until a better night if it is turbulent or aim to a
steadier part of the sky. A steadier part of the sky is judged by steady versus twinkling stars.
A collimated telescope
should appear
symmetrical with the
central obstruction
centered in the star's
diffraction pattern.
[ 本帖最后由 musicworm 于 2007-7-23 13:53 编辑 ] 原帖由 我爱祖祖 于 2007-4-3 14:38 发表 http://www.astronomy.com.cn/bbs/images/common/back.gif
我想请教一下，C8调光轴的问题：
如果看到衍射圈不是同心圆，请问如何调整：是先调整厚的一端还是先薄的一端？或者同时调整？厚的一端应该松还是紧螺丝？同理我就可以知道薄的一端如何处理了。::0020:: ...
这几个联接我觉得最有用：
http://home.comcast.net/~astrophoto/Articles/Collimation.htm
http://www.mira.org/ascc/pages/lectures/collim.htm
http://skywatch.brainiac.com/collimation.pdf
第一个尤其有用！ 原帖由 wbhifi 于 2007-7-24 11:43 发表 http://www.astronomy.com.cn/bbs/images/common/back.gif
这几个联接我觉得最有用：
http://home.comcast.net/~astrophoto/Articles/Collimation.htm
http://www.mira.org/ascc/pages/lectures/collim.htm
http://skywatch.brainiac.com/collimation.pdf
第一个尤其有用！ ... [/quote
::hairsmile:: ::hairsmile:: ::hairsmile:: 这个图好
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