tarkennusetäisyyden

Tarkennusetäisyys, often translated as focal distance or focusing distance, refers to the specific distance between the optical center of a lens and the sensor or film plane of a camera when the subject is in sharp focus. This distance is not fixed but varies depending on the focal length of the lens and the distance of the subject being photographed. For instance, a wide-angle lens will have a different tarkennusetäisyys for a subject at infinity compared to a telephoto lens.

The concept of tarkennusetäisyys is crucial for achieving sharp images. When a photographer adjusts the focus ring on their lens, they are essentially changing the distance between the lens elements and the sensor to ensure that light rays from the subject converge precisely on the sensor plane. If the tarkennusetäisyys is incorrect, the image will appear blurred. Different lenses are designed to focus at different ranges, and their minimum and maximum tarkennusetäisyys values are often specified by the manufacturer. Understanding this parameter helps photographers select the right lens for a particular shooting scenario and effectively utilize its focusing capabilities. In macro photography, for example, achieving a precise and short tarkennusetäisyys is paramount.