Manual Focus 500mm F6.3 Metal Bodied Lens with Tripod Mount Ring. Features two ED (extra-low dispersion) glass elements for good coma control and an F6.3 aperture, helping you capture stunning deep-sky objects with reduced chromatic aberration. It has an 82mm filter size, weighs 307g, is Full Frame compatible, has a closest focusing distance of 3.3M, and a 5-degree viewing angle. The optical design consists of 8 elements in 5 groups, including 2 high refraction index elements to effectively control spherical aberrations. The TTArtisan 500mm f6.3 Lens is perfect for shooting distant subjects like astrophotography, wildlife, and sports. Its built-in tripod collar ensures easy mounting on a tripod, and the large focus gear ring provides precise manual focusing. Ideal for shooting distant images without distractions, this lens is suitable for creators wanting to enjoy the fun and creativity of telephoto photography.