Читать книгу Collins Complete Photography Manual - Collins Dictionaries - Страница 82

In modern cameras, zoom lenses have largely taken over from lenses with fixed focal lengths (‘prime’ lenses). The versatility of zooms means that you do not have to carry around a number of different prime lenses, or keep changing lenses for different subjects.

However, zoom lenses do have a couple of intrinsic disadvantages. One is that their maximum apertures are lower than those of prime lenses. Whereas a 50mm prime lens might have a maximum aperture of f/1.8, a typical ‘standard zoom’ might have a maximum aperture off/4 at this focal length.