Profoto Softbox 3x4' Diffuser Kit 1 f-stop Light Modifier with Hook-and-Loop Fasteners (White)Profoto Softbox 3x4 Feet Diffuser Kit 1 f stop Light Modifier (White) The Profoto Softbox Diffuser Kit 1 f stop is designed to deliver beautifully soft, even lighting ideal for portrait, fashion, and commercial photography. Compatible with the Profoto Softbox line, this kit includes both a front and inner diffuser to reduce harsh shadows and create a natural, flattering light spread. Measuring 3x4 feet, the diffuser provides broad light coverage,