Definition of teleconverter in English:

teleconverter

Syllabification: tel·e·con·vert·er
Pronunciation: /ˌteləkənˈvərtər
 
/

noun

Photography
  • A camera lens designed to be fitted in front of a standard lens to increase its effective focal length.
    More example sentences
    • You might want to look into getting a 1.4x teleconverter, or a longer lens.
    • In fact, most professional bird photographers use a 500 mm or 600 mm lens coupled with a teleconverter to extend the focal length as much as possible.
    • Armed with my 2x teleconverter on my 200 mm - 500 mm Tamron zoom lens set at 500 mm, I fired off a number of shots at close range to capture some of the details of this bird that are not visible from farther away.

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