NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Inverting telescope for sextant
From: David Fleming
Date: 2013 Dec 19, 10:52 -0800
From: David Fleming
Date: 2013 Dec 19, 10:52 -0800
It depends on the state of your eye. Do you need eyeglasses?
To find focal length, take it outside and focus the sun to as small a spot as possible on a piece of paper. Distance from paper to screen is focal length.
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