Type of camera lens (7)
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'type of camera lens' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for telephoto that I've seen before include "Kind of lens" , "Long-distance lens" , "Distant shooter" , "Sort of lens" , "Magnifying lens in a camera" .)
(Other definitions for fisheye that I've seen before include "Very wide-angle lens" , "Kind of lens" .)