An ETC Source Four Lens Tube – 5º is an ultra‑narrow beam lens designed for very long throw applications where maximum precision and intensity are required. The 5º beam creates a highly focused, concentrated light that is ideal for isolating small details, lighting performers from extreme distances, or highlighting architectural and scenic elements without spilling light into surrounding areas. This lens produces sharp shutter cuts and a tightly controlled field, making it best suited for specialty uses rather than general lighting. It installs directly into compatible Source Four ellipsoidal fixtures and is commonly used in large theaters, arenas, and venues with long front‑of‑house throw distances.