40x40mm Square Fresnel Lens, Solar Condenser Magnifier for DIY Projector with PMMA Thread(70mm)

Precision-molded PMMA acrylic lens delivers 92% light transmission for efficient solar concentration, LED beam shaping and projection experiments. Available in 40mm, 50mm and 70mm focal lengths with a fine thread pitch of 0.015mm or 0.025mm, offering flexible optical control for custom constructions. The ultra-thin 2mm profile and 40x40mm square spacing make it easy to mount into DIY projector housings, stage lights or flashlight lens holders. The durable acrylic construction withstands temperatures from -40°F to +176°F, ensuring stable performance in both indoor experiments and outdoor solar applications. Versatile tool for expanding fine details, conducting optical research or developing product prototypes, compatible with standard LEDs and machine modules.