optical zoom
noun [ C or U ] uk/ˌɒp.tɪ.kəl ˈzuːm/ us/ˌɑːp.tɪ.kəl ˈzuːm/
光学变焦
a device in a camera that uses the camera's lens to make the thing being photographed appear nearer
The camera comes with 10X optical zoom. 该相机带有10倍光学变焦功能。
Most digital cameras have both optical zoom, in which the lens moves, and digital zoom, which manipulates the image electronically. 大多数数码相机都有光学变焦和数码变焦两种功能，前者通过镜头移动，后者则以电子方式处理图像。
Compare: digital zoom
- More examples
- The camera’s 18x optical zoom is among the industry’s longest zooms.
- Using a high-resolution camcorder and its optical zoom lens, a colleague snapped eight close-up photos of my eye.
- If you want more magnification than the optical zoom can handle, it's better to achieve it on a computer after the fact.