The Pen or PEN series is an Olympus camera brand. It was used on analog half-frame compact and SLR models from 1959 until the early 1980s. In 2009, Olympus released the PEN E-P1, a digital mirrorless interchangeable-lens camera, which opened the range of Digital PEN models, which are still sold today. Olympus Corporation's camera division since has been bought by Japan Industrial Partners, and run under the OM Digital Solutions name. They continue to run the Digital PEN series.