camera lens with a variable focal length
Nikkor 28–200 mm zoom lens, extended to 200 mm at left and collapsed to 28 mm focal length at right
A zoom lens is a system of camera lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed-focal-length (FFL) lens (prime lens).
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).