What is the difference between a long focal length and a short focal length?

Taking photography as an example, the difference between long focal length and short focal length: a long focal length lens is a lens with a longer focal length than the standard focal length, and vice versa.

The long focal length has a narrower viewing angle, that is, it is necessary to "focus" on a small piece in a wide field of vision and image this small piece on the substrate or photosensitive chip, so this part will be larger. Therefore, the long focal length is mostly used to shoot distant scenery, such as birds, racing cars, airplanes, sailing boats and so on. A short focal length is the opposite, and the viewing angle is larger, so that the film contains a wider landscape. Suitable for taking magnificent buildings, taking photos and taking vast scenery.

Photography, together, is painting with light. Photography refers to the process of recording images with some special equipment. Generally, we take photos with mechanical cameras or digital cameras. Sometimes photography is also called photography, that is, the process of exposing the photosensitive medium by using the light reflected by the object. Someone once said an incisive language: the photographer's ability is to transform the fleeting ordinary things in daily life into immortal visual images.

Generally called photography, it is based on the principle of pinhole imaging, that is, through the lens, the negative film is developed into a single photo by using the camera image for permanent preservation. But the image of the photo is motionless and silent, only for people to watch its characters and artistic conception, and then understand its meaning.