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    Re: Compact Lightweight Metal Sextants - Freiberger Yacht vs. Astra IIIB
    From: Alexandre Eremenko
    Date: 2012 Aug 11, 04:18 -0400

    Dear  Jim and John,
    > I deplore the idea of eliminating the clear glass on the horizon mirror.
    > I also dislike "whole
    > horizon" mirrors, finding the horizon difficult to discern at twilight.
    I completely agree. Classical large, 1/2-silvered mirror is the best
    > Has anyone produced a horizon mirror with a gradation from full on the
    > right to zero on the left? That sounds handy. Should I patent the idea?
    I don't think this is a good idea. But you can try to patent it:-)
    John, you say:
    > The only sextant that does the optics right is the Navy Mark
    > II, it has a very wide, high quality, FOV.
    I would be more cautious and say: "The only sextant I tried..."
    Have you ever tried an SNO with an inverting scope?
    (Of those I tried it has no equal...)
    But on a small boat, in rough sea, I think the only reasonable
    solution iz a "zero-tube".

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