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    Dream Choice of Sextant
    From: Mike Hannibal
    Date: 2005 Aug 8, 16:43 +1000

    If you had a choice between a C&P Horizon Ultra and a
    C&P Pelorus which would you choose? Money isn't the
    issue.
    
    The use is the full breadth of uses to which you might
    put a sextant with an equal balance between
    star/planet sights, sun sights and coastal nav stuff -
    distance off, horizontal bearing etc.
    
    For those unfamiliar the key differences between the
    two instruments are:
    
    1) both use the same frame and "running gear";
    
    2) the Horizon Ultra has a whole horizon mirror,
    polarisers in both sets of shade glasses and
    Schueler's double prism to get verticality right. In
    other words it's a specialist sun machine;
    
    3) the Pelorus has standard shades, an astigmatiser
    for stars and planets, and an unusual horizon mirror
    that is about 70% silvered in the a centre vertical
    strip and unsilvered on either side. It is designed to
    be very effective with dim stars but still OK brighter
    objects.
    
    I guess my current thinking is that the polarisers are
    nice and make sun brightness and horizon clarity very
    easy to get just right but that the Polaris is
    proabably better for stars as it isn't hampered by the
    known issues of a whole horizon mirror. On balance
    what I want is the Pelorus with the polarisers as
    well. I expect that verticality of the instrument will
    not be an issue when using the astigmatiser but that
    you'll just have to rock like you always do when doing
    sun/moon.
    
    Love to hear your views, and particularly if anyone
    has used the Polaris or the Horizon Ultra.
    
    Regards
    
    Pelorus
    
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