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
    Name or NavList Code:
    Email:
       
    Reply
    Re: Ebbco Sun Shade Modification
    From: Greg Rudzinski
    Date: 2016 Oct 25, 13:54 -0700

    A complete set of filter replacement combinations for the older Ebbco will require using lighter mylar neutral density film as a single layer on the horizon mirror shade or stacked x2 , x3, or x4 on the index mirror shade to add to the dark solar film filter.  A source of neutral density mylar film can be salvaged from the heavy sunglasses handed out by optometrists post eye exam.  4 circular shades can be cut from one pair of these mylar wrap around sunglasses. Stack to the desired amount of shading into the  Ebbco filter frame then snap the retainer ring into place. I was able to complete and test this modification in less than an hour. Very helpful for horizon glare when observing a low altitude Sun. 

    Greg Rudzinski 

    From: Greg Rudzinski
    Date: 2014 Sep 1, 10:00 -0700

    Sun shades on many older Ebbco plastic sextants seem to degrade. The solution is to replace the filter with dark solar film (Thousand Oaks Optical). This will greatly improve the view of a bright Sun and reduce shade error over the original. If both index and horizon shades are modified then index error determination is improved. An artificial horizon image is also improved.

    The filter size is 1.6" in diameter. The mylar film can be cut using the original filter as a template.

    Greg Rudzinski



    Attached File: 



    Attached File: 



    Attached File: 

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

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

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

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

    Email Settings

    NavList ID 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