Originally Posted by
rpcrowe
Of course, the advantage of shooting with a "normally sharp" lens and adding the diffusion in post-processing is that you have an unaltered image to work with and can add any degree of diffusion you desire. When shooting with the SF lens and/or diffusion filters; what you shoot is what you get!.
OTOH... I remember the great difference between shooting a film image using diffusion and diffusing the image when printing. When shooting, the highlights are diffused and when printing, generally it was the darker areas that are diffused.