Cooke Optics Mini S4i 135mm T2.8 35mm/Super 35mm Prime Lens with PL Mount. Cooke's goal has been to deliver a smaller, lighter lens which offers the same resolution, optical quality and reliability as the S4/i, but at a lower price. Cooke decided that the lenses should be equally suitable for shooting film and digital images up to and beyond a 4K resolution pipeline. In addition the lenses include /i Technology, providing lens data per frame for downstream post production. Like the S4/i lenses, the Mini S4i's are designed for motion photography and they don't breathe. The lenses are one stop slower than the S4/i, as a result they can be smaller and lighter. All Cooke lenses are colour matched. This means Mini S4i by Cooke and S4/i lenses can be mixed on a shoot with full confidence that the images will match.