EXTENSION TUBE Meaning and
Definition
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An extension tube, in photography and videography, refers to a cylindrical device that is inserted between a camera body and a lens to increase the distance between them. It is commonly used for macro photography or close-up work, allowing users to focus on subjects at an extremely close range.
The extension tube is typically made of metal or plastic and comes in various lengths, usually ranging from a few millimeters to several centimeters. It connects to the camera's lens mount on one end and provides a new lens mount for the lens on the other end. This adjustment repositions the lens farther away from the camera's image sensor, modifying the focal length and enabling focus at a closer distance.
The primary purpose of an extension tube is to achieve higher magnification levels when capturing small or intricate subjects. By increasing the distance between the lens and the camera sensor, it allows the lens to focus on details that are much closer than its normal minimum focus distance. The extension tube does not contain any optical elements, so it does not affect image quality or introduce additional aberrations.
Furthermore, extension tubes are most commonly used with interchangeable lens camera systems, where lenses can be detached and replaced. They are a cost-effective alternative to dedicated macro lenses, as they can be used with existing lenses, saving photographers from investing in specialized macro equipment.
Common Misspellings for EXTENSION TUBE
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Etymology of EXTENSION TUBE
The word "extension" originated from the Latin word "extensio" which means "stretching out" or "expanding". It ultimately comes from the Latin verb "extendere", meaning "to stretch out". As for the word "tube", it comes from the Latin word "tubus" which refers to a hollow cylindrical structure, typically used for conveying fluids or gases.
Therefore, the term "extension tube" combines the concept of "stretching out" or "expanding" with the idea of a hollow cylindrical structure. In the context of photography or optics, an extension tube is a hollow cylindrical device that attaches between the camera body and lens, enabling the lens to focus at closer distances and creating the effect of increasing the focal length of the lens.
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