焦距

• Pinyin: jiāo jù
• Desglose de hanzi: 焦 = focal point (from 焦点); 距 = 足 (foot) + 巨 — distance

Significado

Distancia focal.

Technical term used in photography and optics. Determines the magnification and field of view of a lens. Longer focal length means more zoom and narrower field of view; shorter focal length means wider angle and less magnification.

Ejemplos

1. 这款镜头的焦距是50毫米，非常适合拍人像。
2. 调整焦距可以改变照片的景深效果。
3. 长焦距镜头可以把远处的景物拉近。

Guía de uso

Contexto: photography, optics, technology

Tono: neutral

Correcto

• 你这个镜头焦距是多少？(What's the focal length of your lens?)
• 焦距越长，背景虚化越明显。(The longer the focal length, the more pronounced the background blur.)

Incorrecto

• 用'焦距'描述对焦清晰度 (Don't use 焦距 for focus sharpness — that's 对焦; 焦距 is specifically the lens focal length)

Origen e historia

Composed of 焦 (focal point) + 距 (distance). A technical term from optics describing the focal distance.

Contexto cultural

Generación: All ages

Contexto social: Photography enthusiasts