What is a teleconverter?

Teleconverter is attaching to the camera lens that changes the focal length, always expressed in a millimeter (mm). This is often called the Tele Extender, because most of these secondary camera lenses extend or multiply the focal length of its connected host. With this accessory, a 100mm lens for portrait photography can easily convert to 300 mm for sports photography. Optically cropped and enlarges the center of the image captured by the host lens.

The different models of these converters are specified by their multiputing factor - usually 1.4x, 2x or 3x. The 35 mm lens connected to the 2x converter creates an enlargement of the image equivalent to a lens of 70 mm, twice its focal length. It is also often called a telephoto lens. Standard lens approaching normal human vision can economically serve double and as a lens capable of displaying other objects. Separate, larger and heavier, usually a very expensive telephoto lens may not be purchased.

If the standard lens has been cross -cut for the analytical track of the light path that bent along a series of concave and convex optical elements, there will be focus behind the lens where there would be a film sheet. The teleconverter attached to its rear end captures part of this light before the convergence and passes through other optical elements to bend it again to the focus point just behind the unit. The overall light light that focuses on focus will be extended or extended. Most models are therefore mounted between the camera and the lens.

There are several important characteristics of all teleconverters. Modern cameras have sophisticated electronic controls such as automatic focus and exposure; The converter model must be compatible with the camera and the lens if these functions are to be maintained. The quality of the glass elements of the converter is an important, but also the loyalty of its connected hostLens. The teleconverter also increases optical flaws of the lens under quality. Most of the characteristics is to reduce image resolution and reduce the amount of light reaching a film or chip circuit.

For cameras with fixed lenses, the teleconverter is called the TELESIDE converter, which is connected to the front of the lens. They can be alternatives for camcorders and compact digital cameras without removable and interchangeable lenses. They effectively convert the lens to a remote display telephoto lens. However, most models are a simple combination of afocal or non -focusing glass lenses. Even quality will often introduce unusual aberrations, such as darkened edges, to the picture.

6, however, is technically impossible to build the equivalent of the teleconverter, such as a 0.5x multiplier designed to connect to the rear of the lens. Another accessory connecting the camera with the lens is the hollow extension tube. They do not have any optical elements and therefore do not translate the focal length of the lens. PRSolving reduces the focus distance of the lens and increases the magnification; It is used for macro or detailed photo.