An ETC Source Four Enhanced Definition Lens Tube – 50º is a wide‑angle lens designed to deliver broad, even light coverage with improved clarity and focus in Source Four ellipsoidal fixtures. The 50º beam angle is ideal for short throw distances, making it well suited for wash lighting, front light, and filling large stage areas from close positions. Enhanced Definition lenses are engineered to produce cleaner beam edges, better contrast, and more uniform light compared to standard lens tubes, helping reduce color fringing and uneven falloff. This lens tube installs easily into compatible Source Four fixtures and is commonly used in theaters, studios, houses of worship, and other settings where smooth, consistent coverage is more important than tight beam control.