Extension

EN: Extension tubes

Arta

Tubular device that fits between the lens and the camera body to enable the photographer to take close-up pictures. The degree of close-up available varies with the length of the tube used.
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Extension tubes

Tubes made from metal or rigid plastic inserted between the lens and the camera, thereby making the lens to film distance greater. The result is increased magnification for close-up photography. They are sometimes also referred to as extension rings . They are frequently sold in sets of three different lengths, each of which can be used on its own or in combination with the others. When stacking more than one extension tube between the camera and lens, magnification can exceed life size. However, exposure time can be quite long as magnification increases since light must travel much further to strike the sensor or film.

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Extension

1. A small program that enables a Macintosh computer to control things such as print drivers and USB devices. 2. In a more general computer sense, it is an alphanumerical character string appended to a file name and delimited by a full stop (period). In the file name photo.jpg, jpg is the extension, which tells the computer that it is dealing with a certain type of compressed image file. .

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Extension ring

Also known as Extension Tubes. An Extension Ring is a device placed between the lens and camera body to extend the lens-to-film (or imaging sensor) distance for closer focusing. Available in various sizes, extension rings can be used singly or in combination to vary the reproduction ratio. Nikon cameras using these support them in Manual focus mode only and they are considered non-CPU lens attachments. .

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Extension tubes

These are a handy way to turn any long lens into a macro lens for ultra-close shooting. They are hollow metal tubes that are mounted between the camera and the lens. Typically they come in a set of different lengths which can be combined. It is a good idea to open up the lens a little when using an extension tube, as a little light is lost. It should be noted that they do not work when used with wide lenses.

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Extension amount

With a lens that moves the entire optical system backward and forward when focusing, the amount of lens movement necessary to focus a subject at a limited distance from the infinity focus position.

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Extension bellows.

Device used to provide the additional separation between lens and film required forclose-up photography. Consists of extendible bellows and mounting plates at frontand rear to fit the lens and camera body respectively.

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Extension tube

A hollow tube that fits between the lens and camera body to extend the lens-to-film/sensor distance and increases its close-focus capability. Although extension tubes can be bought separately, they often come in sets of three tubes with different lengths, which can be used indivually, or in any given combination. .

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Extension tubes.

Metal tubes used to obtain the additional separation between lens and film for close-upphotography. They are fitted with screw thread or bayonet mounts to suit variouslens mounts.

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Extension bellows

Extendable device that fits between the lens and the camera body that enables the photographer to take close-up shot with a variable degree of magnification.

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