200mm Round Acrylic Fresnel Lens, Concave Magnifying Glass with -350mm Focal Length for Wide Field LED Optics

The precision-molded acrylic Fresnel construction offers a wide 200mm field with a focal length of -350mm, ideal for beam expansion or image reduction in optical configurations. High light transmittance of 93% ensures efficient performance for LED collimation, projection experiments or displaying large documents with minimal distortion. Threaded outer edge simplifies mounting on standard lens mounts or custom frames, providing secure positioning for stable optical alignment. Ultralight, weighing only 65g and only 2mm thick, this concave lens reduces installation weight without sacrificing optical clarity or durability. Versatile for teaching workshops, DIY projector constructions or magnifying tasks where a negative focal length and wide aperture are required.