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250MM Round Fresnel Lens Negative Focal Length Concentric Circles Thread PMMA Lens Expand Field of View

200MM Negative Focal Length Round Fresnel Lens PMMA Thread Reduce Lens Expand Field of View

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250mm Fresnel Lens Magnifying glass Long Focal length Optical PMMA Solar Concentrator Concentric Thread Lens

250mm Fresnel Lens Magnifying glass Long Focal length Optical PMMA Solar Concentrator Concentric Thread Lens

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345X345MM Focal Length 350MM Square PMMA Fresnel Lens Optical Concentric Threaded Solar Concentrator Magnifier

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92x48mm Optical PMMA Plastic Solar Fresnel Lens Focal Length 250mm Projector Plane Magnifier Solar Cncentrator Lens

250mm Big Face Magnifying glass Optical PMMA Solar Fresnel Lens Focal length 185mm 240mm 290mm 500mm 1000mm Concentrater

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