Iphone has the difference between telephoto and telephoto-free.

Difference: Without telephoto, you can't shoot long-distance landscape figures. The telephoto lens in iphone is a necessary condition for shooting a long-range view, and the telephoto function is needed for long-distance landscape character photography.

A long focal length lens refers to a photographic lens whose focal length is longer than that of a standard lens. Telefocal lenses are divided into ordinary telephoto lenses and ultra-telephoto lenses. The focal length of ordinary telephoto lens is close to that of standard lens, while the focal length of ultra telephoto lens is much larger than that of standard lens. Take 135 camera as an example, the photographic lens with a focal length of 85 mm -300 mm is a normal telephoto lens, and the lens with a focal length of more than 300 mm is a super telephoto lens.

Shooting with a long focal length lens has the following characteristics:

Small angle of view

Therefore, the spatial range of the shooting scene is also small, and the shot image is larger than the standard lens at the same shooting distance, which is suitable for shooting the details of the distant scene and shooting the subjects that are not easy to get close to.

Short depth of field

So you can highlight the subject in a messy environment. However, it brings some difficulties to accurate focus adjustment. If the focus is slightly inaccurate when shooting, the subject will be blurred.

Poor perspective effect

This kind of lens has obvious characteristics of compressing space depth and exaggerating background. When using a long focal length lens, it is usually used to shoot distant scenes. Due to the absorption of air and the influence of diffuse light, the contrast of the captured image is small, and the dust particle extinction is serious, so it is not easy to achieve very accurate focusing.

When shooting with a telephoto lens over 300mm, it is difficult to focus all colors of light on one point, resulting in sub-spectral problems. Based on the above situation, sometimes the image quality of the shot works is not high.