The Collaborative International Dictionary
telephotographic lens
Telephoto lens \Tel`e*pho"to lens\ n. a special compound camera lens with a long effective focal length but used in a camera with a short focal length, allowing large images to be obtained of distant objects when used in a camera in place of an ordinary lens; -- called also telephotographic lens.
Wiktionary
telephotographic lens
n. (context photography English) (alternative nametelephoto lens)