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    Re: How does the AstraIIIb split mirror work?
    From: Jim Thompson
    Date: 2004 Apr 25, 06:23 -0300

    > -----Original Message-----
    > From: Ken Muldrew
    > > From: Jim Thompson:
    > > I repeated the experiment, this time blocking the horizon mirror's
    > > clear window from the front.  Not surprisingly I guess, for all 3
    > > sighting devices (sight tube, 4.5x30 and 6x40 telescopes) I only saw
    > > the index mirror's image in the right half of the field of view, and
    > > it stopped sharply at the center of the field of view where the
    > > vertical edge of the mirror ended.
    >
    > This is surprising. When I block my horizon mirror's clear window from
    > the front (leaving the mirrored half unblocked), I see the index mirror's
    > image across the entire field of view with a 5x36 scope.
    >
    > Ken Muldrew.
    
    By "front" I meant the side toward me, toward the telescope, not the side
    away from me, toward the horizon.  Were we talking about the same "front"?
    
    Jim
    
    
    

       
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