Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Sextants and glasses
    From: Paul Werner
    Date: 2014 Mar 21, 12:39 -0700

    Bruce Bauer writes – The Sextant Handbook – “What many people end up doing is taking the sight bare eyed with the scope adjusted to compensate for vision defects and then putting on the glasses for reading time and altitude.”
    My problem is that I can’t do that adjustment using my SNO-T sextant. I am short sighted – about minus 8 dioptres nowadays – and it isn’t possible to shorten the Galilean scope enough to get a clear image without glasses. Thus my problem is reversed to that described by Bruce Bauer. I can read and write both with and without glasses but I can’t take sights without them.
    The solution is so obvious and simple that it must have been tried before. A compensating lens is gently pressed into the rubber eye shield. It is a lens from an old pair of glasses, cut circular, diameter 28 mm.
    See attachments!
    I am of course aware of that this is possible because of the design of this particular eyes shield and perhaps not optimal from an opticians point of view - but for me better than a sextant / glasses combination.
    As to taking off / putting on glasses when using binoculars or taking sextant sights I just push them, the glasses, up above my eyebrows. A slight grimace and they are back on my nose. And it helps that I always have a glasses strap when aboard.

    Paul Werner

    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------

    File:



    File:



       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site