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For a while I have been wondering about a simple economical way to
display digital information in the sight tube or telescope of a
sextant, along the lines of a compass monocular, rangefinder, or
hybrid optical digital rangefinder.  Of course there are things other
than azimuth one could overlay, a stop clock, some star info, a camera
looking at the micrometer and arc, an artificial horizon? I am not
saying this is necessary, just a bit of fun.

I just came across an excellent "how to" on the construction of an
economical hybrid (camera style) range finder using two lenses and a
prism. It's a great blog post and video covering a bit of history, the
optics and how to make it with standard catalogue parts and a bit of
3D printing. https://volzo.de/thing/hybridviewfinder/,  including the
calculations for the design of the optics.

I thought NavList readers who wanted to try an optics project but were
lacking the experience might appreciate this.

Best wishes

Bill Lionheart

   

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