zoomobjektiivi

Zoomobjektiivi, also known as a zoom lens, is a type of photographic lens that can change its focal length. This allows the photographer to zoom in or out on a subject without physically moving the camera. Unlike prime lenses, which have a fixed focal length, zoom lenses offer versatility in framing shots.

The focal length of a zoom lens is typically expressed as a range, for example, 24-70mm. This indicates that the lens can provide a wide-angle view at 24mm and a more telephoto view at 70mm. The aperture of a zoom lens can either be constant throughout the zoom range (e.g., f/2.8) or variable, changing as the focal length is adjusted.

Zoom lenses are popular for their convenience, especially in situations where changing lenses is impractical, such as during live events or wildlife photography. However, they can sometimes be larger and heavier than prime lenses. The optical quality of zoom lenses can also vary, with some high-end zoom lenses rivaling prime lenses in sharpness and image quality.

The design of a zoom lens involves multiple lens elements that move relative to each other to alter the effective focal length and maintain focus. This complex optical design is what enables the zooming capability. Zoom lenses are a staple in many camera bags due to their adaptability for a wide array of photographic scenarios.