An ETC Source Four Lens Tube – 70º is an extra‑wide lens designed for very short throw distances where maximum coverage is required. The 70º beam spreads light broadly across the stage, making it useful for front light, close‑mounted fixtures, and filling large areas from positions near the performance space. This lens is often chosen when fixtures are mounted on electrics, box booms, or low pipes and need to cover wide sections evenly without using multiple lights. It installs directly into compatible Source Four ellipsoidal fixtures and is commonly used in theaters, studios, and houses of worship where smooth, wide coverage is more important than tight beam control.