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
    SNO-T "night" sight tube?
    From: Tony Oz
    Date: 2018 Nov 19, 06:03 -0800

    Hello!

    On a flee market I finally managed to find a "night" (Galilean, non-inverting, 3x50) sight tube for my SNO-T (old C&P clone). I took it apart to clean the optics.

    It consists of only two lenses - the object and the ocular.

    But right next to the object lens there is another sitting place (~48mm screw) as if for one more lens.

    As it is this sight tube gives clear and undistorted image approximately 3 times "closer" - just as advertised.

    I wonder what that extra - apparently missing - lens could be? Is it really missing or is it for some sight tube modification?

    Please comment.

    Thank you in advance.

    Warm regards,

    Tony

    60°N 30°E

    PS

    The seller asked me if I want the "day" sight tube - which inverts the image and gives ~7x magnification.

    Why one tube gives "direct" non-inverted image and the other - inverted? Is it (the image inversion) useful for something navigational?

       
    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