Kiinteäpolttovälin

Kiinteäpolttovälin is a Finnish term that translates to "fixed focal length" in English, commonly used in photography and optics. It refers to a lens that has a single, unchangeable focal length. Unlike zoom lenses, which can alter their focal length to provide a range of magnifications and field of view, a fixed focal length lens has a set perspective.

These lenses are often referred to as prime lenses. They are generally known for their optical quality, sharpness, and wider maximum apertures compared to many zoom lenses. The simpler optical design of a prime lens often leads to fewer aberrations and better light-gathering capabilities. This makes them popular choices for low-light photography and for achieving a shallow depth of field, which blurs the background and makes the subject stand out.

Common focal lengths for fixed lenses include wide-angle (e.g., 24mm, 35mm), standard (e.g., 50mm), and telephoto (e.g., 85mm, 135mm). Each focal length offers a distinct perspective and is suited for different types of photography, such as landscapes, portraits, or street photography. Photographers often have to physically move closer to or further away from their subject to recompose their shot when using a fixed focal length lens, which can encourage a more deliberate and creative approach to composition.