equivalent lens的意思|示意

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Equivalent lenses are defined as lenses with the same angle of view and corresponding aperture, but with different focal lengths. In other words, equivalent lenses are lenses that have the same field of view and the same maximum aperture, but with different focal lengths.

Equivalent lenses are typically used in photography to help create a different effect. For example, a wide-angle lens has a wider field of view than a telephoto lens. However, if one wants to zoom in on a subject without having to use a longer focal length lens, one can use an equivalent lens with a shorter focal length. In this case, the shorter lens will have the same field of view as the longer lens, but it will have a larger maximum aperture, allowing the photographer to capture more light.

Additionally, equivalent lenses can also be used to capture different levels of depth of field. For example, a wider lens can be used to create a shallow depth of field, while a longer equivalent lens will create a deeper depth of field.

Finally, equivalent lenses are also used for perspective control. A wider-angle lens can be used to create a wider field of view, while an equivalent lens with a longer focal length can be used to create a narrower field of view. This is especially useful for photographing landscapes and other subjects where an ideal perspective is desired.

In short, equivalent lenses are lenses that have the same field of view and the same maximum aperture, but with different focal lengths. They can be used to create different effects, capture different levels of depth of field, and provide perspective control.