Re: [APML] need suggestions on how to use a reducer with a Taurus TIII

[Wei-Hao Wang <whwang@gmail.com>]

Hi Jason,

Thank you very much for the explanation.  This clears some of my questions
but also arises some others.  

First, as you explained, the Taurus reducer sits inside the guider and there
is no distance problem.  But is the Taurus reducer optimized for Tak FS?
If not, then the distance doesn't really matter because it's not optimized 
anyway.  On the other hand, if I want to use an optimized reducer (like the
one made by Tak), then there might be a distance problem after adding in
a guider between the camera and the reducer.

The second question is, is it true that all the reducer do is to correct for
its own color and field curvature?  As I know, APOs like the Tak FS has
significant astigmatism.  Doesn't the reducer also correct for this?  How 
sensitive to the distance do you think the astigmatism correction is?

Wei-Hao


-- 
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Wei-Hao Wang  :)

Institute for Astronomy at University of Hawaii

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