Optical zoom measures the actual increase in the focal length of the
lens. Focal length is the distance between the center of the lens and
the image sensor. By moving the lens farther from the image sensor
inside the camera body, the zoom increases because a smaller portion of
the scene strikes the image sensor, resulting in magnification.
When using optical zoom, some digital cameras will have a smooth zoom, meaning you can stop at any point along the entire length of the zoom for a partial zoom. Some digital cameras will use distinctive stops along the length of the zoom, usually limiting you to between four and seven partial zoom positions.
When using optical zoom, some digital cameras will have a smooth zoom, meaning you can stop at any point along the entire length of the zoom for a partial zoom. Some digital cameras will use distinctive stops along the length of the zoom, usually limiting you to between four and seven partial zoom positions.
No comments:
Post a Comment