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
    Re: Cannot focus sextant telescopes
    From: David C
    Date: 2016 Aug 2, 14:52 -0700

    Here is some more detail.

    A and B are objectives. C is an eyepiece that slides into either A or B. Both telescopes are inverting. If I look at the sun or a distant object and slide the eyepiece in and out Ithe telescope does not focus.

    D is a sight tube. It is what I use to take sights.

    E is a filter that screws onto  C and D.

    F is a lens with male threads on eiher side. The threads are of different diameters.  My guess is that  is to make the image erect. However despite trying just about every combination I can think of I cannot work out how it is meant to be used. I wonder if a tube with female threads at each end is missing, although there are no spare slots in the case.

    My questions are therefore:

    (a) How do I  get the telescopes to focus?

    (b) What is F?

    (c) Are the telescopes for sun sights and the binoculars for star sights? Clearly the binoculars cannot be used for sun sights because one half bypasses the sextant filters.

       
    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