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I purchased a 30 x 40 linear Fresnel lens, and built a frame for it out of 2 x 2 lumber. This frame is mounted on a wooden stand which allows me to tilt

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Big Size Fresnel Lens Solar Energy Outside Solar Cooker Diameter 500 Focal Length 300/500/620mm Solar Fresnel Lens - Lenses - AliExpress

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Dia. 465mm Optical Fresnel Lens DIY Solor Condensor Outdoor Barbecue Focal 240mm

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