En fotografía, un objetivo gran angular es aquel cuya distancia focal es menor a la del objetivo normal, resultando un ángulo de visión mayor al de la visión humana. Se usa para vistas panorámicas, como paisajes, para periodismo fotográfico y otros proyectos creativos. Los ángulos de visión de este tipo de objetivos oscilan entre 60 y 180°. Las distancias focales para cámaras de 35mm varían entre 18 y 35mm. En el caso de los objetivos gran angulares de longitud focal fija, la luminosidad suele ser alta, llegando hasta f1.4 (véase apertura y número f).

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In photography and cinematography, a wide-angle lens refers to a lens whose focal length is substantially smaller than the focal length of a normal lens for a given film plane. This type of lens allows more of the scene to be included in the photograph, which is useful in architectural, interior and landscape photography where the photographer may not be able to move farther from the scene to photograph it. Another use is where the photographer wishes to emphasise the difference in size or distance between objects in the foreground and the background; nearby objects appear very large and objects at a moderate distance appear small and far away. This exaggeration of relative size can be used to make foreground objects more prominent and striking, while capturing expansive backgrounds. A wide angle lens is also one that projects a substantially larger image circle than would be typical for a standard design lens of the same focal length. This large image circle enables either large tilt & shift movements with a view camera, or a wide field of view. By convention, in still photography, the normal lens for a particular format has a focal length approximately equal to the length of the diagonal of the image frame or digital photosensor. In cinematography, a lens of roughly twice the diagonal is considered "normal".

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