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    Re: Dream Choice of Sextant
    From: Mike Hannibal
    Date: 2005 Aug 8, 18:40 +1000

    Hi Alexandre,
    
    my brain is addled - I meant Polaris. My apologies.
    
    I would be very happy if you would expnd further on
    your views about the "gimmicks".
    
    Thanks
    
    Mike
    --- Alexandre E Eremenko 
    wrote:
    
    > 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.
    >
    > Alex.
    >
    > 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
    > >
    >
    
    
    Send instant messages to your online friends http://au.messenger.yahoo.com
    
    
    

       
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