Glossary |
Terms that are on use on this site.
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| Image circle | The diameter of the sharp image circle formed by a lens. Interchangeable lenses for 35mm format cameras must have an image circle at least as large as the diagonal of the 24 x 36mm image area, and EF lenses generally have an image circle of about 43.2mm. TS-E lenses, however, are designed with a larger image circle of 58.6mm to cover the lens\' tilt and shift movements. |
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| Image distance | The distance from the lens\' rear principal point to the film plane when the lens is focused on a subject at a certain distance. |
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| Image magnification | The ratio (length ratio) between the actual subject size and the size of the image reproduced on film. A macro lens with a magnification indication of 1:1 can reproduce an image on film the same size as the original subject (actual size). Magnification is generally expressed as a proportional value indicating the size of the image compared to the actual subject. (For example, a magnification of 1:4 is expressed as 0.25x.) |
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| Image Stabilizer | A superb new technology that allows the lens to sense movement from \"shake\" or vibrations, and instantly apply an optical correction by moving a group of lens elements. The improvement in steadiness can be seen even in the viewfinder, and most users find they can shoot hand-held or on a monopod at shutter speeds about two stops slower than previously possible and consistently get sharp images. |
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| Index of refraction | A numerical value indicating the degree of refraction of a medium, expressed by the formula n=sin i/sin r is a constant which is unrelated to the light ray\'s angle of incidence and indicates the refractive index of the refracting medium with respect to the medium from which the light impinges. For general optical glass, \"n\" usually indicates the index of refraction of the glass with respect to air. |
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| Inner focusing | Focusing is performed by moving one or more lens groups positioned between the front lens group and the diaphragm. |
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| Internal Focusing | Imagine being able to focus a lens without it changing in size. Nikon’s IF technology enables just that. All internal optical movement is limited to the interior of the nonextending lens barrel. This allows for a more compact, lightweight construction as well as a closer focusing distance. In addition, a smaller and lighter focusing lens group is employed to ensure faster focusing. The IF system is featured in most NIKKOR telephoto and selected NIKKOR zoom lenses. |
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