MAXIMIZE 2" (5 cm) Double Concave Focal Lens. Perfectly crafted for a myriad of technical applications, this lens is the epitome of precision. With a diameter of 50mm (5 cm), it serves as a powerful tool to make objects appear smaller, offering a unique visual perspective that broadens one's view. Primarily used for those who are farsighted, its adaptability doesn't end there. Its double concave design with meticulously ground edges also makes it a popular choice for enhancing the visual capabilities of binoculars and telescopes. Whether you're gazing at the stars or watching a distant event, this lens ensures a broader and clearer field of view. Educators will especially find this lens beneficial. It acts as an engaging, hands-on tool for teaching technical subjects in classrooms, allowing students to interact directly with the principles of optics. This interactive approach not only solidifies understanding but also sparks curiosity and enthusiasm among learners.