"Telephoto" camera part (4)

I believe the answer is:

lens

(Other definitions for lens that I've seen before include "Dark cloud; shining light" , "Through which to view" , "Refracting device" , "Focusing glass" , "optical equipment" .)

I've seen this clue in the USA Today.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.