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    Re: Dream Choice of Sextant
    From: Alexandre Eremenko
    Date: 2005 Aug 8, 02:17 -0500

    Dear Mike,
    I've never heard of a C&P "Pelarus" sextant.
    Maybe you mean C&P Polaris?
    (A "star specialist" as they call it)
    I have a very limited experience with
    C&P sextants (once Fred Hebard let me try his,
    and recently I visited their factory where I had an
    opportunity to try them all from the window of their office).
    And I have to say that NONE of their sextants
    is my "dream sextant":-)
    In particular I was disappointed with all
    these gimmicks like astigmatizer,
    Schueler prism, and fancy horizon glasses.
    I strongly prefer to have a variety of scopes
    and eyepieces instead, an eyepiece filter
    and a simple "traditional" horizon mirror,
    which is most light-efficient of all of them.
    On Mon, 8 Aug 2005, Mike Hannibal wrote:
    > 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
    > Send instant messages to your online friends http://au.messenger.yahoo.com

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