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    Re: Calibrating a Bris with a Davis mk15 sextant
    From: Greg Rudzinski
    Date: 2020 Apr 27, 14:08 -0700

    Alex,

    Sven Yrvind is seen in this YouTube video using his Bris. At minute 04:07 you will see him showing the Bris attached to glasses.

    https://www.youtube.com/watch?v=pm79kH2BBMY

    Looking through a sight tube on a sextant with the eyeglass mounted Bris will get you calibration angles within 10' moa. For high precision it will be necessary to use the natural horizon. What I do is mount the Bris to a DSLR camera for added consistency. It is possile to sandwitch and weatherproof a Bris between two UV camera filters as seen in attached images.

    Greg Rudzinski

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