The best use I found for the 12x16" softbox was with the strobe mounted high on a Stroboframe over the lens bracket, angled down a bit, for a butterfly lighting effect for portraits within about six feet from the subject. I used it with a Norman LH2 head, which is a barebulb head, so the effect may be softer than with a Metz 45. I eventually switched to a Norman mini-octabox, which is a bit more versatile and quicker to set up, but it isn't adaptable to a Metz.