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tags:
- "⭐topic/⚙️hardware/\U0001F4F7camera"
---
# focal length   
   
A camera lens’ focal length is the distance (usually given in millimeters) from the first lens element to the [focal point](../../notes/camera/focal%20point.md). The focal length is a description of how aggressively a lens system converges light—the longer a focal length, the more acute the angle of the refracted light, while shorter lengths necessarily refract more sharply to reach focus within the smaller distance. Focal length determines the resulting [field of view](https://en.m.wikipedia.org/wiki/Field_of_view), with longer focal lengths providing more magnification than shorter lengths.