Which term describes a lens with a variable focal length that allows zooming?

Which term describes a lens with a variable focal length that allows zooming?

• A. Variable Focal length
• B. Prime lens
• C. Fixed Focal Length
• D. Frame Rate

Answer: (A)

A lens that can change its focal length to zoom is described by having a variable focal length. This means the lens can be adjusted to different focal lengths, letting you widen the scene or crop in on a subject without switching lenses. A prime lens, in contrast, has a single fixed focal length and cannot zoom. A fixed focal length is another way to say the same thing—no zoom capability. Frame rate relates to how many frames per second in video, not to how a lens focuses or zooms. So the term that best matches the ability to zoom by changing focal length is variable focal length. In practice, people often call this a zoom lens.

A lens that can change its focal length to zoom is described by having a variable focal length. This means the lens can be adjusted to different focal lengths, letting you widen the scene or crop in on a subject without switching lenses. A prime lens, in contrast, has a single fixed focal length and cannot zoom. A fixed focal length is another way to say the same thing—no zoom capability. Frame rate relates to how many frames per second in video, not to how a lens focuses or zooms. So the term that best matches the ability to zoom by changing focal length is variable focal length. In practice, people often call this a zoom lens.