PREMIUM PMMA MATERIAL: Made of optical-grade acrylic (PMMA) with 92% light transmittance for bright, clear image and beam control PRECISE SPECIFICATIONS: 1.8mm thickness, 0.3mm thread pitch, 50mm focal length, available in 20mm and 30mm diameters VERSATILE LIGHTING USE: Ideal for LED lights, stage lights, flashlights and fishing lights to adjust beam and output angle DIY & OPTICAL PROJECTS: Great for DIY projectors, VR glasses, magnifying observation and various optical experiments or research STABLE PERFORMANCE: Works reliably from -40°C to +80°C, suitable for indoor and outdoor optical applications
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