Internal Focusing |
Internal Focusing (IF)
Internal Focusing (IF) technology has given Nikkor lenses an added dimension -- it allows the lens to be focused without any change in its size. With all optical movement limited to the interior of the non-extending lens barrel, IF has made it possible to design lighter, more compact telephoto lenses.
Among these are the AF-S Nikkors which have virtually become standard equipment for fast-breaking sports photography around the world.
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Silent Wave Motor |
Rear Focusing (RF)
Rear Focusing (RF) technology uses rear lens groups for focusing. Since rear lens groups are smaller than front lens groups, especially in high-speed telephoto lenses, RF technology makes it possible to drive the lens smoother and faster.
RF also contributes to high optical performance.
AF-S Nikkor lens
Nikon’s AF-S technology involves the integration of the Silent Wave Motor (SWM) into supertelephoto lenses like the 300mm, 400mm, 500mm and 600mm, and zoom lenses with fast maximum aperture like 17-35mm, 28-70mm and 70-200mm.
This gives these lenses quick, ultra-quiet autofocus operation, making them ideal for sports and fast-action photography.
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Defocus-image Control |
AF DC-Nikkor lens
One of Nikon’s unique contributions to portrait photography is DC (Defocus-image Control) technology. This unique Nikon innovation enables users of AF DC-Nikkor lenses to control background and foreground blur precisely, resulting in striking portraits. These lenses are the only ones of their kind in the world.
DC ring is set at neutral position (Fig. 1):
Background blur and foreground blur have the same characteristics.
DC ring is set at R (rear) position (Fig. 2):
Spherical aberration occurs. In this case, light rays from the background look beautifully soft and blurry -- declining in intensity from the core of the light source outward. On the other hand, light rays from the foreground are blurred with ring-shaped halos.
DC ring is set at F (front) position (Fig. 3):
Spherical aberration occurs in reverse direction (R position). In this case, light rays from the foreground look beautifully soft and blurry.
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| Nikon Super Integrated Coating (SIC) | ED glass | Aspherical Lens |
Close-Range Correction (CRC) | Internal Focusing (IF) | Rear Focusing (RF) |
AF-S Nikkor lens | AF DC-Nikkor lens |
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Color of images appearing in this website may differ from the originals.
Specifications are subject to change without any notice or obligation on the part of the manufacturer. December 2003
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Presented by Nikon Corporation Imaging Company, Tokyo, Japan.
Copyright ©1997-2003 Nikon Corporation. All rights reserved. |
