Tarkennusetäisyys

Tarkennusetäisyys refers to the distance at which a lens is in focus. In photography and optics, when a lens is focused on a specific point, that point is at the focal distance. Objects at this distance will appear sharp, while objects closer or farther away will appear blurred. This concept is fundamental to understanding depth of field, which is the range of distances that appear acceptably sharp in an image.

The tarkennusetäisyys is typically set by adjusting the focus ring on a camera lens or a microscope. Different lenses have different focal lengths, which influences the tarkennusetäisyys and the field of view. For instance, telephoto lenses have a longer tarkennusetäisyys and a narrower field of view, while wide-angle lenses have a shorter tarkennusetäisyys and a wider field of view.

In scientific contexts, such as with microscopes, the tarkennusetäisyys is critical for achieving clear magnification of a specimen. The ability to precisely control and measure the tarkennusetäisyys allows for detailed observation of microscopic structures. Similarly, in astronomy, telescopes are focused to bring distant celestial objects into sharp relief, with the tarkennusetäisyys determined by the telescope's design and the object being observed. Understanding tarkennusetäisyys is therefore essential for anyone working with optical instruments.