Tamrons SP (superior performance) lens series was born in 1979, making this year the 40th Anniversary of the series. In celebration, Tamron has developed the model F045, The distillation of Tamron?s accumulated lens-making expertise and craftsmanship. This Orthodox fixed focal lens, which some consider the most basic of all interchangeable lenses, is the embodiment of all optical technology and manufacturing know-how Tamron has developed to date. The model f045?s unprecedented high-resolution image quality and beautiful, appealing background bokeh let photographers capture any scene down to the finest details. The external lens barrel was developed through tireless pursuit of operability and durability, focusing constantly on the needs of photographers. This lens is equipped with a large f/1. 4 aperture and high-speed, high-precision AF functionality offering exceptional reliability, plus various other features for increased convenience, making it the perfect everyday lens for your creative pursuits.