film SLR's. [ edit ] One Unusual 'Standout' Design - The Olympus Pen F Series The  Olympus Pen F  series was introduced and produced by  Olympus  of  Japan  between 1963-1966. The System consisted of the original Olympus Pen F, later the behind-the-lens metering Pen FT, 1966-1972; and the non-metered version of