Westcott 5639 43" Deep Umbrella Diffusion Panel

The Westcott 5639 Diffusion Panel is a purpose-built accessory designed to stretch across the opening of Westcott's 43-inch deep parabolic umbrella, effectively converting it into a large, soft light source that mimics the output of a deep octagonal softbox. The panel attaches securely using elastic edging that hugs the umbrella's rim, while an adjustable drawstring at the shaft entry point lets you cinch the fabric snugly around your speedlight, strobe, or continuous monolight. This dual-attachment design keeps the fabric taut and in position, even when repositioning the umbrella between shots.

The diffusion fabric itself is a neutral white material engineered to spread light evenly without introducing any color cast, so your white balance remains consistent whether you are shooting portraits, product photography, or video. By containing and softening the light that would otherwise spill outward from the umbrella's open face, the panel produces a more controlled and flattering quality of light with gentler shadow transitions. It is lightweight enough to fold into a gear bag alongside the umbrella, making it a practical modifier for photographers who need soft, professional-grade lighting both on location and in the studio.