2pcs 100mm Fresnel Linse Condensing Lens Focal Length 40 50 60 70

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Fresnel Lenses Find and Compare Optical Lenses at MEETOPTICS

12-inch Fresnel Lens High-definition Mobile Phone Amplifier Bracket Lens DIY Projector Magnification Condensing Reading

12-inch Fresnel Lens High-definition Mobile Phone Amplifier Bracket Lens DIY Projector Magnification Condensing Reading Glasses

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Could something like a Fresnel lens be used to give smartphones higher optical zoom while maintaining a slim form factor? - Quora

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Thickness: 2mm Pitch of thread: 0.3mm (Diameter 100mm Focal length 120mm is 0.5mm) Lens material: PMMA / Acrylic Magnifying observation Image or

GatherTOOL 1PC Dia 20 30 40 42 50 60 70 80 90 100 MM FL28-120 Round Fresnel Lens Threaded Condenser Concentric for LED Spotlight DIY Projector VR