What are the features of a standard lens, a wide angle lens, and a telephoto lens?

The focal length of 50-55mm is the field of view of a standard lens, and it is called a standard lens because it is close to the angle of view of the human eye.

The one below 50mm is called a wide-angle lens, which is characterized by a wide field of view and a strong sense of space, but the wide-angle lens is not necessarily seriously deformed.

The telephoto lens is also called a telephoto lens, and in layman's terms, it is to bring the distant scenery closer, and it can narrow and compact the space.

The standard lens is 50-55mm, just a normal lens with no wide-angle framing and telephoto zoom framing.

The wide-angle lens is 28-35mm, the smaller its value, the wider the field of view, (such as shooting the whole neighborhood, the whole street, etc.). Conversely, the higher the value, the smaller (narrower) the field of view.

The telephoto lens is also called a zoom lens, ranging from 70-210mm or 80-300mm.

The standard lens is the closest to the angle of view of the human eye, the wide-angle lens is more seriously deformed, more exaggerated, and has a stronger sense of space, and the telephoto lens can bring the distant lens closer and make the space look more flat.

The sense of space is different, the shorter the focal length, the stronger the sense of extension, and the longer the focal length, the weaker the three-dimensional effect.

Nowadays, everyone uses digital cameras, and the focal length is wide. Standard. What about telephoto lenses?

This depends on the sensor size of the camera. Usually we take the 135 film machine as the standard. If the 100mm lens is used in an ordinary home camera, how much more telephoto power it has?

Digital telephoto lens SLR camera also has full-frame and APS format, zoom lens is, the focal length can be changed, wide angle to telephoto such as: 28-300 mm. How can a telephoto lens be called a zoom lens?

But there is a difference between zoom and prime focus.

1. Standard lens: The definition of the standard is the same for the fixed focus head and the zoom head, and there is not much description of the fixed zoom here. The focal length of this type of lens is roughly equal to the diagonal length of the frame, the angle of view is about 40-53°, the focal length of the traditional 135 camera and the commonly used full-frame camera is about 40-55mm, and the so-called half-frame (APS-C) is generally 35mm, which is about 2 3 of the full frame.

It can be simply understood that achievement is the closest to the normal vision of a person, characterized by the fact that the picture is real but also plain, suitable for documentary.

2. Wide-angle lens: The focal length of this kind of lens is less than 40mm shorter than that of the standard lens for full-frame cameras, and the angle of view is 60° larger than that of the standard lens. As the name suggests, a large viewing angle means a wide field of vision, a long depth of field is clear, and a large range is large, emphasizing the foreground to highlight the contrast between near and far, and the near and far are large and small, giving people the illusion of a longer distance in the direction of depth, so as to produce a shocking effect as a whole.

The ultimate expression of this lens is the fisheye lens.

3. Telephoto lens: As the name suggests, the focal length of this lens is longer than that of the standard lens, and it can be called telephoto if it is about 85mm up for a full-frame camera, and the angle of view is small at 20 ° down, and it is divided into ordinary telephoto and super telephoto according to different parameters. The focal length is long, the angle of view is small, and it can shoot larger images than standard lenses at the same distance, and the short depth of field can well blur the background and highlight the subject, which is suitable for shooting distant scenes.

Think of it as a telescope, but there is still a big difference between the two. This type of lens has high requirements for shooting technology, and is suitable for professionals, so if you are interested, you can consult the relevant professional knowledge.

To put it simply! For example, the sensor (imaging area) of the full-frame DSLR is 36 24mm, and the focal length of the standard lens is about 50mm, and the perspective effect of the standard lens is equivalent to that of the human eye. A lens with a focal length smaller than a standard lens can be called a wide-angle lens, a lens with a focal length larger than a standard lens can be called a mid-focus lens (about 100mm), and a longer lens (such as more than 200mm) can be called a telephoto lens.

A zoom lens is a lens with a variable focal length, such as an 18 200mm zoom lens, which contains focal lengths from wide-angle to telephoto. Those with a fixed focal length are called prime lenses, such as 50mm standard lenses.

A wide-angle lens is a short-throw lens that has a wider angle of view than the average standard lens. It has the following features:

1. The picture obtained through the shooting of the wide-angle lens can increase the sense of spatial depth of the photographic picture, and can better distinguish the spatial sense of the picture space.

2. The angle of view is wide, but the depth of field is very deep, which can effectively ensure that the front and rear scenes of the subject can be clearly reproduced on the screen; That is, the front and back of the subject feel is strong, and there is a perspective effect, which is conducive to enhancing the appeal of the picture.

3. Proper deformation, the more short-focus deformation, the easier it is to appear, and the wide-angle lens is easy to deform around the frame, sometimes this distortion can better highlight the subject.

4. At the same distance, the wide-angle lens shoots more widely, which expands the range of use. For example, it is possible to shoot a picture of EdUHK in a relatively small space. It's impossible to keep a handheld camera completely shaky.

Choosing a camera or lens with stabilization and adopting an effective holding posture can reduce the effects of shaking.

Structural characteristics of the reverse telephoto lens: It is composed of a front negative lens group and a rear positive lens group.

The construction characteristics of the telephoto lens are composed of a front positive lens group and a rear negative lens group.

The double Gaussian objective is the first objective with a large field of view (about 40°) to reach f2 in which the relative aperture is the first.

The addition of two glued surfaces makes it possible to better eliminate aberrations. Although the dispersion of the glass on both sides of the glued surface is different, the refractive index is approximately the same, so the addition of the glued surface has little effect on the monochromatic aberration.

Structural features: The reverse telephoto lens is composed of a front negative lens group and a rear positive lens group; A telephoto lens consists of a front positive lens group and a rear negative lens group.

Are you talking about a reflex telephoto lens, a reflex lens: short and fat in appearance, light in weight, simple in structure, and relatively cheap. The imaging is also good.

The main disadvantage of the reflex lens is that the general aperture is fixed, and the aperture is small, so it is difficult to shoot handheld, it must be used with a tripod, the lens output is small, almost all of them are manual lenses, and the automatic function is basically not available. Another feature is that some of the out-of-focus light spots produce beautiful doughnuts, which is unique to this lens.

Ordinary telephoto lens: there are many advantages, such as high degree of automation, fast focusing speed, good imaging, large aperture, many lens groups, large room for choice, etc. The disadvantages are: high, large size, heavy weight, may be inconvenient to carry, etc.

Summary. 1) A lens with a standard lens focal length approximately equal to the diagonal length of the film is called a standard lens. The focal length of a standard lens is between 43-58 mm.

The angle of view of this lens is moderate, and the range of the captured image and the perspective relationship presented by the scene are more in line with the visual habits of the human eye. As a result, the image has good reproducibility, fidelity, and a wide range of applications. It is often used in landscapes, portraits, travel technology photography, etc.

It has a close-up attachment and is often used for close-up shooting. The image quality of the standard lens is better than that of other similar lenses, and the large aperture is very advantageous for shooting in low-light conditions. In addition, it is small in size and easy to carry.

What are standard lenses, wide-angle lenses, and telephoto lenses.

1) A lens with a standard lens focal length approximately equal to the diagonal length of the film is called a standard lens. The focal length of a standard lens is between 43-58 mm. The angle of view of this lens is moderate, and the range of images taken by the stool and the perspective relationship of the scene are more in line with the visual habits of the human eye.

As a result, the image has good reproducibility, fidelity, and a wide range of applications. It is often used in landscapes, portraits, travel technology photography, etc. It has a close-up attachment and is often used for close-up shooting.

The standard lens has a better quality than other similar lenses, and the wide aperture is very advantageous for shooting with low-light strips. In addition, it is small in size and easy to carry.

2) Wide-angle lenses are divided into ordinary wide-angle lenses (focal length equal to or greater than 24mm) and ultra-wide-angle lenses (focal length between 17-21mm).The angle lens is slightly exaggerated and distorted, but due to its clear image field, large depth of field and sufficient angle of view, it is increasingly valued by the photographer Shu Zheng Ying, especially suitable for indoor photography and photojournalism and other occasions with small spaces. The lens of the chaotic wide-angle lens is greatly magnified and distorted, but its angle of view is very wide and telephoto, usually around 90 -135, which is not often advantageous for shooting scenes at small distances and large scenes.

In the event, it is more suitable to use this type of lens to play a role, it has a very strong visual impact on **, but it has a great impact on the main scene. The focal length is shorter, so the focal point g is usually much closer than other lenses, and it is possible to shoot up to a distance of nearly meters. In addition, this lens has a greater depth of field.

3) A telephoto lens is also known as a telephoto lens, and it can shoot large scenes from a distance. Depending on the length of the focal length, such lenses can be divided into Puyan closed telephoto lenses (focal length between 80-300 mm) and super telephoto lenses (focal length between 300-2000 mm).Focal Wide-angle Telephoto, handheld shooting requires a higher shutter speed to keep the image sharp.

When shooting hard-to-access scenes, Zheng Lee telephoto lenses are often used. It can take full advantage of its strengths in capturing the momentary motion of people and moving scenes, as well as all kinds of wildlife photography. Use this lens to attenuate the perspective of the image, and the foreground and background perspectives remain almost constant.

Due to the long focal length and small depth of field of the lens, it must be precisely adjusted when used.

Wide-angle lens imaging features are ().

a.Small viewing angles.

b.The corners of the pants are large.

c.The scenery is small.

d.The shooting is far away from Biankai.

Correct Answer: Suspect B