Double Convex K9 Optical Glass Lens, Diameter 20-58mm, Focal Length 40-200mm(D42 F50 C8 E2.3)

HIGH QUALITY K9 OPTICAL GLASS: Made from premium K9 optical glass, this lens ensures superior light transmission and clarity for all your magnification needs. VERSATILE DIAMETER & FOCAL LENGTH - With a diameter range of 20-58mm and a focal length of 40-200mm, this lens is perfect for various applications in photography and scientific experiments. Double convex: The biconvex structure provides excellent magnification and minimizes distortion, making it ideal for detailed observations and high-quality imaging. PRECISION MEASUREMENTS - Each lens is measured manually for more precision, with a tolerance of only 0.3mm, ensuring reliable performance for your projects. Complete pack: This pack includes a lens, ready to sublimate your photos and scientific explorations. Enjoy a smooth shopping experience with our customer service!