Canon CN-E 14mm T3.1 L M EF Mount Digital Cinema Prime Lens CN-E14mm (p/n 8325B002AC) canon_8325b002ac_cn-e-14mm-ef-f / 8325B002. Part of Canon’s range of EF Cinema prime lenses, the CN-E14mm T3.1 L F is a lightweight, compact fixed focal length lens designed for EF mounts. It offers spectacular 4K image quality and a full frame image circle plus great low light performance and fine creative control over focusing and depth of field.