Based on filters originally developed by Lee Filters for use in the film industry, the Soft Set consists of five soft filters that take the image from a subtle, barely noticeable softening to a heavy diffusion. Made from the highest quality, optically correct polyester-based materials, these lightweight & inexpensive filters are ideal for every type of portraiture & social photography. The soft effect is virtually independent of aperture or focal length variations, & the degree of softening increases progressively through the range.