Adding a fresnel lens

Square Precision PMMA Fresnel Lenses, Focal Length : 212mm, Material : PMMA, Size : 250mm x 250mm

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a) Schematic of a continuous surface Fresnel lens (the groove

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Adding a fresnel lens

Fresnel Lens and Three Ships – Dan Coe Art

Fresnel Lens

8 Fresnel Lens - 75/175 Series (L/F-8) - Altman Lighting

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Stretchable Binary Fresnel Lens for Focus Tuning