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This photographer rigged a waist-level viewfinder from cheap mirrors for US$10 – and he’s sharing how you can, tooWarner learned through a process of trial and error, trying different concave and Fresnel lenses plus a tiny square mirror he found at a craft store. Once he found the combination that worked best ...
While it seems commonplace now, the Fresnel lens was an important invention ... a lighthouse was an oil lamp, a concave mirror, and an ordinary lens. This made the lighthouses difficult to spot.
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