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Re: Mark IV mount

(>>TD, >HJ)

> *>I agree.  I have to build a focus scheme.  This involves allignment to
> *>a milliradian or better.  Once I work out how to allign the camera and the
> *>telescope, aligning two telescopes is duck soup.
> 
> Let's see, that's 57/1000 or .06 degrees, about 3 minutes of arc. That
> should be doable, even with gears. HOw do you plan to drive the declination
> axis, with any corrections for various errors?

Now I see what Tom was getting at.  Keeping the CCD normal to the
optical axis would be a problem with a big CCD.  I think you 
could look at the image itself and know if the alignment was off 
and by how much.  It is likely cheaper to build in adjustments 
(shims?) them to depend on exact machining.


-- 
   --Chris Albertson             home: chrisja@jps.net        
     Redondo Beach, California   work: chris@topdog.logicon.com