Definition of telephoto lens noun from the Oxford Advanced Learner's Dictionary

 

telephoto lens

 noun
noun
BrE BrE//ˌtelifəʊtəʊ ˈlenz//
 
; NAmE NAmE//ˌtelifoʊtoʊ ˈlenz//
 
 
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a camera lens that produces a large image of an object that is far away and allows you to take photographs of it
See the Oxford Advanced American Dictionary entry: telephoto lens