page_title: Teleconverter
hierarchical_section_title: Teleconverter
context_page_description: A teleconverter is a secondary lens mounted between a camera and a photographic lens which enlarges the central part of an image obtained by the objective lens. A 2× teleconverter for a 35 mm camera would enlarge the central 12×18 mm part of an image to the size of 24×36 mm in the standard 35 mm film format.
  Teleconverters are typically made in 1.4×, 1.7×, 2× and 3× variants, with 1.4× and 2× being the most common.
  A 2× teleconverter effectively doubles the focal length of a given lens. Teleconverters also decrease the intensity of the light that reaches the film plane by the square of its magnification. A 2× teleconverter reduces the light to 1/4, doubles the focal ratio and halves the resolution of an image.
context_section_description: A teleconverter (sometimes called tele extender) is a secondary lens mounted between a camera and a photographic lens which enlarges the central part of an image obtained by the objective lens. A 2× teleconverter for a 35 mm camera would enlarge the central 12×18 mm part of an image to the size of 24×36 mm in the standard 35 mm film format.
  Teleconverters are typically made in 1.4×, 1.7×, 2× and 3× variants, with 1.4× and 2× being the most common.
  A 2× teleconverter effectively doubles the focal length of a given lens. Teleconverters also decrease the intensity of the light that reaches the film plane (or sensor) by the square of its magnification. A 2× teleconverter reduces the light to 1/4, doubles the focal ratio and halves the resolution of an image.
caption: A teleconverter attached between a camera and its objective
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