Welcome to the NavList Message Boards.


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

Compose Your Message

Add Images & Files
    Re: How does the AstraIIIb split mirror work?
    From: Ken Muldrew
    Date: 2004 Apr 25, 07:47 -0600

    From:                   Jim Thompson 
    > By "front" I meant the side toward me, toward the telescope, not the
    > side away from me, toward the horizon.  Were we talking about the same
    > "front"?
    Yes, the paper that I'm using to block the glass is lying right overtop of
    the glass, between the scope and the glass. When I do this with a sight
    tube I can clearly see the paper and the mirror/glass split, but when I do
    it with a 5x scope, the paper is too dim to notice and I see a full view of
    the index reflection across the whole field of view. I did this in partial
    darkness, so perhaps if there was a bright light shining on the paper, it
    would reflect enough light to interfere with the image.
    I see the effect you described in your initial post of this thread even if
    there is no glass surface for the image to reflect off of.
    Ken Muldrew.

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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