Purpose: The Profoto Softbox 1x4-Feet Diffuser Kit 1 f-stop features interchangeable diffusers that allow you to choose and switch between different levels of softness Light Reduction: The 1x4-Feet Diffuser Kit 1 f-stop is designed to soften the light and create a more even distribution, reducing harsh shadows and creating a beautiful, natural look Density Filter: The diffuser can also be used as a neutral density filter when, for instance, youre working with low apertures or long exposures Available Options: The different diffusers span from 0.5 f-stop, which provides a slightly softer light, up until 1.5 f-stop, creating more effective softness to the light