What do you mean by wide angle and telephoto?

1, a long focal length lens refers to a photographic lens with a longer focal length than a standard lens.

Wide-angle lens refers to a photographic lens with shorter focal length, larger viewing angle, longer focal length and smaller viewing angle than the standard lens.

2. The telephoto lens has a long focal length, a small viewing angle and a large image on the negative. Therefore, at the same distance, you can take larger images than the standard lens. Widely used to photograph distant objects.

The advantages of wide-angle lens are short focal length and large viewing angle. You can shoot a wide range of scenes at close range, and the prospect is more prominent. The range of depth of field is obviously larger than that of standard lens and telephoto lens, and the picture has a strong stereoscopic effect. Suitable for indoor close-range shooting, shooting mountains, rivers, buildings, crowds and other scenes.

Extended data:

Matters needing attention

1, the scene shot by wide-angle lens is near big and far small, and the perspective effect is exaggerated. The closer the subject is to the camera, the more obvious the exaggeration becomes. Therefore, when taking portraits, people should not be too close to the camera, otherwise it is easy to take deformed photos of "fat nose and mouse ears".

When shooting a building with a wide-angle lens, the lens tilts up or down, which makes it easy for the parallel lines of the building edge contour to shrink or intersect in the distance. Pay attention to choose the contraction point on the center line of the framing picture, otherwise it will easily skew the building image and give people the illusion of collapse.

2. When a wide-angle lens uses a hood or a color filter, it is easy to block the periphery of the lens viewing angle and darken the image field. This situation is not easy to detect when shooting, but it is obvious in the photo. Therefore, when using accessories, be sure to understand their scope of use from the instructions. If there is no explanation in the manual, you should be more careful when shooting.

3. The flash coverage angle of electronic flash is generally equivalent to the viewing angle of 35mm lens of 135 camera. Therefore, when taking flash photography with a wide-angle lens smaller than 35mm, a diffuser should be added in front of the flash window of the flash. If not, you can wrap a layer of white paper or white handkerchief to increase the flash area.

References:

Baidu encyclopedia-lens