A lens that has a varying Focal Length (24mm-120mm for example) is know as what kind of lens?

Question

BlackTom AI · Accepted Answer

To tackle this question about lens terminology, we first restate what each option means and how it relates to a changing focal length.
Option 1 (Telephoto): A telephoto lens describes a long focal length design or a lens with a built-in optical system that produces a narrow field of view. While many telephoto lenses are fixed in focal length, the term does not by itself imply a variable focal length. So this option describes a type by range or design, but not the general concept of changing focal length.
Option 2 (Zoom): A zoom lens is specifically defined by its ability to vary its focal length, such as ranging from 24mm to 120mm. This makes it the correct descriptor for a lens with a changing focal length, since the key feature is the adjustable zoom.
Option 3 (Fisheye): A fisheye lens is an ultra-wide-angle lens with a distinct distorted hemispherical view and a fixed, extremely short focal length. It does not imply a variable focal length or zoom capability, so it does not match the description.
Option 4 (Wide Angle): A wide-angle lens refers to a short fixed focal length that captures a wide field of view. Unless the lens is a zoom variety, the term does not inherently indicate a changing focal length, so it’s not the right match for a lens with variable focal length.
Overall, the distinguishing factor here is whether the focal length can be varied. The zoom lens uniquely encapsulates that ability, whereas the other terms describe fixed-length designs or specific viewing characteristics that do not inherently convey adjustability of focal length.

COMM 2081 B01 Basic Photography Quiz

A lens that has a varying Focal Length (24mm-120mm for example) is know as what kind of lens?

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