The unilens monocular is a simple refracting telescope for field use, designed by Major Baden-Powell, F.R.A.S.. Consisting of only one lens, it is the simplest of all telescopes, and while occupying very little space can still magnify a distant image up to about four times.
The unilens monocular is a simple refracting telescope for field use, designed by Major Baden-Powell, F.R.A.S.. Consisting of only one lens, it is the simplest of all telescopes, and while occupying very little space can still magnify a distant image up to about four times.
Source: Wikipedia "Baden-Powell's unilens" · CC BY-SA 4.0
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