I've just bought a 250mm Imagon with its 3 aperture plates, ND filter and hood. I'd love to get some advice as a Soft Focus Beginner on how best to use it (on either a Sinar or an MPP 5x4 camera). Especially for abstract / landscape / still-life subjects rather than portraiture. The thing it did not come with is any instructions. Are there any books or articles? I read the SF article on the home page here - most interesting but not enough about actually using one.