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    Re: Cannot focus sextant telescopes
    From: David C
    Date: 2016 Aug 2, 15:42 -0700

    Thanks Bill, you have confirmed my suspicion that a tube is missing. I purchased the sextant 40+ years ago and and the case has hardly been opened in that time apart from a burglary when as far as I know nothing was taken. I suspect the tube was missing when I obtained the sextant but will never know.

    I have  determined the following:

    E screws onto C & D.

    Lens on C unscrews and can be replaced by F.

    C has two lenses so is keplerian?

    A & B are one lens each.

    When I take the lens off C I can see a graticule. This is the first time I have noticed it.

    It is dead reckoning weather outside so I probably will not be working on this anymore today (-;

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