The Nikon F Photomic-T is one of Nikon's system-oriented SLR camera with interchangeable viewfinders, focusing screens and a comprehensive motor drive capability. The Nikon F Photomic T was Nikon's first design housing the TTL exposure meter. The Photomic T reads the entire view as seen by the lens and based on the average level of light, makes an exposure reading. To identify the note while it is TTL, there is no "N" inscribed on the finder and no maximum aperture scale on its face. The Nikon F series, the most rugged and reliable cameras made and noted as the camera that changed the direction of modern photography.