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    Re: How does the AstraIIIb split mirror work?
    From: Ken Muldrew
    Date: 2004 Apr 24, 23:10 -0600

    > 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.

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