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Phase One Digital lenses are designed for maximum image quality and freedom of choice. When used with the Phase One P+ digital backs, the image quality is further enhanced through advanced digital optimization in Capture One, the professional raw processing software supplied from Phase One.Not only have all lenses have been measured and profiled for automated enhancement in Capture One, also data regarding the specific position of the lens elements are captured and used for image optimization. This leads to absolute leading image quality with unique replication of the true colors, details and lightning of the captured moment. Phase One Digital lenses uses ecoglass, which contains no lead or arsenic, securing both better image quality and a nature-friendly policy.The Phase One Digital AF 150mm f/2.8 IF Lens is an auto focus medium-telephoto lens with an angle of view of 26 degrees, equivalent to a 93mm telephoto lens in the 35mm format. By using low-dispersion glass, most chromatic aberration is corrected, and high contrast images can be obtained from infinity to the closest distance. The minimum focusing distance is 1m, which is 0.5m shorter than the existing AF 150mm F3.5 Lens. The use of inner focusing system and its well balanced weight make this lens perfect for hand-held photography. The focusing ring allows for front to back switching between auto and manual focus. With shallow depth of field of a faster lens, this lens works well especially in portrait photography.