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: Mirror recoating
    From: Tony Oz
    Date: 2019 Mar 28, 05:03 -0700

    Dear Peter,

    You said:

    If the mirror is translated a little, that will not affect the rotational center of the index arm. It will waste a little light (if the movement results in some vignetting), but that's it.

    Though this is very counter-intuitive after lots of thinking I agree.

    The fact that one may swap a rear-side mirror for a front-side mirror (and vice versa) without any harm - is the Good Thing! Now I can order a front-side mirror with the SiO coating (like here) for my FREIBERGER. With a benefit of lesser light attenuation! I can ask them to put the reflective layer on both sides - for redundacy! If the frontal side gets badly scratched - I'll simply flip the mirror.

    Not sure if such swapping works for the horizon mirror though... With the rear-side reflection I get both the horizon and the body refracted, with the front-side mirror only the horizon refracts. Must think on it more.

    Thank you very much!

    Warm regards,
    Tony

    60°N 30°E

       
    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