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Fresnel Hackaday
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Sub-wavelength lateral detection of tissue-approximating masses using an ultrasonic metamaterial lens
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Large Fresnel Lens
Replacement lenses for Pimax - OpenMR
1pcs large fresnel lens Size:Φ500mm, Focal length:500mm, Thickness:3mm, Material:PMMA(acrylic) Visual Aid for education - Great for Solar
1-Pack Large Fresnel Lens Diameter 500mm Focal Length 500mm Plastic (Acrylic) Lens for solar collecting,magnifying,solar heating,solar projector fire
Two different reviewers mention the only con on psvr2 (Fresnel lens sweet spot) : r/PSVR
Better Beamer Flash Extender Review
Lens, Hackaday