A zoom lens comprises multiple lenses that move in unison, allowing the camera operator to adjust the magnification of the image. By rotating the lens barrel, the operator can change the focal length and the size of the image. This provides a range of magnification options, allowing for greater flexibility and convenience when shooting.
Zoom lenses are popular in film and video production due to their versatility and convenience. They allow the user to adjust the shot without physically moving the camera, making them ideal for situations where the subject is moving or difficult to access. They are also a cost-effective alternative to using multiple prime lenses, providing a range of focal lengths in one lens.
However, zoom lenses do have some drawbacks compared to prime lenses. They often have a narrower maximum aperture, producing images with less shallow depth of field and less control over the focus. They can also produce images with less contrast and more distortion compared to prime lenses.
Overall, a zoom lens is an essential tool for any filmmaker or videographer who values flexibility and convenience. By using a zoom lens, you can adjust the shot quickly and easily, providing a range of magnification options in one lens.