A Wafer Rectangle is a 3:4 proportioned diffusion bank for general use. This standard broad "window" is a classic portrait and product light used just off-camera or overhead on a boom. 29.5 x 21.5 by 11" deep (75 x 55 by 28cm deep). An excellent size for small still-life, single portraits or a more contrasty source for larger sets or when using black and white film.