Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Sonnar T* 135 mm f/1.8 ZA is a high-quality wide-aperture prime telephoto lens compatible with cameras using the Sony lens mount. It was designed by Carl Zeiss and is manufactured under license by Sony. The lens is also compatible with cameras using the predecessor Minolta AF lens mount, however some Minolta SLR cameras will claim an aperture of f/1.7 when the lens is in fact only capable of f/1.8. In photography and cinematography, a telephoto lens is a specific construction of a long focal length photographic lens in which the physical length of the lens is shorter than the focal length. In these lenses the optical centre lies outside of its physical construction, such that the entire lens assembly is between the optical centre and the focal plane. A regular lens of a focal length that is longer than what is considered a normal lens is not necessarily a telephoto lens.

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