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    Re: Curious sextant add-on
    From: Bill Lionheart
    Date: 2020 Oct 22, 07:57 +0100

    Would such a night vision device work for seeing the horizon after
    sunset? As I understand it they amplify low levels of available
    visible and IR light.
    
    I have never looked through night vision equipment but my
    understanding was they are useful for relatively close objects?
    
    I searched for "night vision sextant" and this article from the 1940s
    recommends wearing red glasses for 30mins to enhance your night vision
    https://onlinelibrary.wiley.com/doi/pdf/10.1002/j.2161-4296.1947.tb01111.x
    
    
    Bill
    
    On Thu, 22 Oct 2020 at 01:46, Bill Lockhart  wrote:
    >
    > Ah! I didn't realize that the cap with the pinhole could be removed... it 
    rotated the whole lense until/unless I held the lense and grip just the cap!
    >
    > thanks, all, for the help and assistance
    >
    > View and reply to this message
    

       
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