30mm PMMA Fresnel Lens 5Pcs, Focal Length 15-50mm, Round Magnifier for Solar DIY(30mm)

Precision-molded PMMA Fresnel lens with 92% light transmission, delivering clear magnification and efficient light concentration for solar experiments and optical projects. Available in four focal lengths (15mm, 20mm, 30mm, 50mm) with a consistent 30mm diameter and 1.8-2mm thickness, offering versatile options for various focusing distances. Fine 0.3mm groove pitch ensures smooth, uniform optical performance, reducing distortion and improving image clarity compared to standard Fresnel lenses. Lightweight and durable Reusableplastic construction, resistant to impact and weathering, ideal for DIY solar collectors, magnifiers, and educational demonstrations. Pack of 5 identical lenses provides reliable backup or multi-unit use, suitable for prototyping, classroom projects, or small-scale solar systems.