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    Re: Digital Camera Sextant Hybrid
    From: Greg Rudzinski
    Date: 2008 Dec 5, 14:39 -0800

         Excellent suggestions. I would add that fixed prisms may also do
    the trick. For camera Sun observations my homemade Bris is working OK
    strapped flush to the front of the lens using a rubber band.
    On Dec 5, 11:54�am,  wrote:
    > Greg, a couple of weeks ago, you wrote:
    > "The Brissextant can be attached to a digital camera lens to create a hybrid 
    celestial navigation instrument. I believe this would be the next sensible 
    evolution of digital camera CN."
    > It's an interesting idea. Bear in mind that you still have to "swing the 
    arc" with a fixed-angle sextant (like the Bris) and you also have to align it 
    carefully to ensure that the line of sight is collimated relative to the 
    > "Does anyone know where I can get a Brissextant?"
    > As others already mentioned, they're easy to make.
    > You may also want to experiment with an ordinary fixed-angle sextant. To see 
    what I mean, look at a standard sextant set to, say, 45 degrees. Now fade out 
    all of the components except the index mirror and the horizon glass. They are 
    the essential components that make the sextant work as it does. Afix those to 
    a simple flat board replacing the sextant frame. The mirrors can be 
    permanently glued to the board. They do not need to be adjustable. A 
    fixed-angle sextant like this is easy to make. You could build a dozen of 
    them, one for every ten degrees of altitude. And they can be quite compact, 
    an inch or two on a side, like the original Bris sextant. The big advantage 
    of the Bris design is that you get several fixed angles in one device. The 
    disadvantage of the original Bris design is that it works primarily with the 
    Sun, the Moon is you're lucky. A simple fixed-angle device can be extended in 
    all the usual ways that sextants have evolved. You could hold one in front of 
    a small spotting scope if you want higher magnification. You could add shades 
    for viewing the Sun as well as the stars. You could even add some sort of 
    adjustable arm and a scale to... wait, wait... we're back where we started. 
    > -FER
    Navigation List archive: www.fer3.com/arc
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