RO: Teleconverter EN: Teleconverter
An optical system mounted between the camera body and the lens to increase the effective focal length of the lens.
Called extender , lens extender or telephoto extender by some manufacturers. (Not to be confused with an extension tube !). A teleconverter is an accessory that fits between the camera lens and body to increase the focal length of a lens by 1.4x, 1.7x, 2x or 3x. When coupled with a 200mm lens, for instance, teleconverters would give these results: a 1.4x teleconverter gives an effective focal length of 280mm, while a 1.7x teleconverter increases this to 340mm, a 2x teleconverter to 400mm and a 3x to no less than 600mm. Teleconverters are compatible only with selected lenses, so always check with the manufacturer or retailer before buying. Although they will work with some zoom lenses, they re best used with (fast) prime lenses, since there usually is a drop in quality, and many prime lenses give a higher level of quality to start with. Besides changing the effective focal length, the effective aperture of the attached lens is increased by one or more stops as well. Autofocusing usually does not operate if the effective maximum aperture is greater than f/5.6 with the lenses/cameras from most manufacturers (in some cases greater than f/8, like on the Canon EOS 1V and EOS 3 cameras). And not all teleconverters support autofocus in the first place! .
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Sistem optic pus in fata sau spatele unui obiectiv foto care mareste distanta focala si micsoreaza unghiul de cuprindere. Reprezinta o alternativa ieftina pentru un teleobiectiv dar scade calitatea imaginii originale. .
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Sistem optic pus in fata sau spatele unui obiectiv foto, care mareste sau micsoreaza distanta focala. De obicei scade calitatea imaginii originale.
Cel Mai folosit cuvant: sau | Domeniu Aplicare : Fotografie | Caractere: 123 Cuvinte: 22 | Limba: Engleza | Sursa f64.ro