What are the three major categories of lenses and what are the characteristics of imaging

The lens is divided into wide-angle and medium-focus.

There are three types of telephoto lenses.

1. Wide-angle lens.

In the case of a 35mm single-lens reflex camera, for example, a wide-angle lens usually refers to the focal length of the lens.

Lenses between about 17 and 35 mm.

The basic feature of a wide-angle lens is that the lens has a large angle of view and a wide field of view. The range of things that can be observed from a single viewpoint is much larger than what the human eye sees at the same viewpoint; Depth of field.

long, can exhibit a considerable range of clarity; It can emphasize the perspective effect of the picture, and is good at exaggerating the foreground and expressing the sense of distance and proximity of the scene, which is conducive to enhancing the appeal of the picture.

2. Telephoto lens.

The angle of view of the telephoto lens is within 20 degrees, and the focal length can reach tens of millimeters or hundreds of millimeters. Long focal length lenses.

It is divided into two categories: ordinary telephoto lenses and super telephoto lenses. The focal length of a normal telephoto lens is close to that of a standard lens, while the focal length of a super-telephoto lens is much larger than that of a standard lens. Taking the 135 camera as an example, the photographic lens with a focal length of 85mm-300mm is an ordinary telephoto lens, and the lens with a focal length of 300mm or more is a super telephoto lens.

Telephoto lenses have a long focal length and a small angle of view, and large imaging on the negative. As a result, larger images can be captured at the same distance than standard lenses. Ideal for shooting distant subjects.

Because its depth-of-field range is smaller than that of a standard lens, it can blur the background more effectively to highlight the subject in focus, and the subject is generally far away from the camera, so there is less distortion in the perspective of the portrait, and the portrait is more vivid, so people often refer to the telephoto lens as a portrait lens.

However, the telephoto lens has a longer barrel, heavy weight, ** is relatively expensive, and its depth of field is relatively small, which is difficult to align with the focus in actual use, so it is often used in professional photography.

3. Medium focus lens.

A mid-focus lens is similar to what we call a "header" and its effect is similar to what our human eyes see. This focal length.

The prime effect is very rich, and it is almost uniformly wide aperture. The mid-focus coverage is about 35 to 85mm, and the field of view and perspective are relatively close to the human eye, so the image shot with some of its focal lengths will be closer to what we see with the human eye, and it can almost be described as "what you see and what you get".

Features: Extra-large aperture creates nice bokeh.

Since a mid-focus lens is a prime lens.

It has the largest aperture in the wide aperture, and the wide aperture is also very useful for bokeh in the foreground and foreground, which is good for creating a nice bokeh effect.

According to the size of the focal length number, there are standard lenses and wide-angle lenses.

telescopic lenses and other types.

1. Standard lens.

With a focal length of between 40 and 55 mm, the perspective of the scene is relatively close to that of the eye, and the image of the subject can be realistically reproduced. At the same time, the standard lens is small in size and easy to carry.

2. Wide-angle lens.

The lens has a large angle of view and a wide field of view. Depth of field.

long, can exhibit a considerable range of clarity; It can emphasize the perspective effect of the picture, and is good at exaggerating the foreground and expressing the sense of distance and proximity of the scene.

3. Telescopic lens.

Lens focal length. long, and thus the field of view.

Narrow, shallow depth of field. It is suitable for photographing celestial bodies such as the rising sun, sunset, and the moon.

In short, the lenses are mainly divided into the following focal lengths: standard (the angle of view of the lens is similar to that of the human eye, and the size is small and the aperture is large, which is suitable for documentary photography); Wide-angle (suitable for expressing a wide scene), medium focus (appropriate background blur effect, small image distortion suitable for portrait shooting), telephoto (image compression effect is obviously used for ecological animal nature photography), macro (used to shoot images with a 1:1 or even greater imaging ratio to reflect small objects).

1. According to the focal length, there are fixed focal length type, telescopic type, automatic aperture or manual aperture and other types.

2. According to the size of the focal length number, there are standard lenses, wide-angle lenses, mountains, telescopic lenses and other types.

3. According to the aperture, there are fixed iris type, manual iris type, automatic iris type (autoiris) and other types.

4. According to the lens telescopic adjustment method, there are electric telescopic lenses, manual telescopic lenses and other types.

There are three types of lenses: wide-angle, mid-focus, and telephoto lenses.

Wide-angle: It is generally used to shoot large scenes such as landscapes, venues, and buildings.

Medium focus: used to shoot portraits, humanities, and landscapes suitable for this focal length.

Telephoto: Suitable for shooting long shots, concerts, and street shots.

The lens has two fingers in film and television, one refers to the optical components used by the movie camera and projector to generate the image, and the other refers to a continuous picture shot from the start to the shutdown, or the clip between two editing points, which is also called a lens. One finger and two fingers are two completely different concepts, in order to distinguish the difference between the two, one finger is often referred to as an optical lens, and the other is referred to as a lens picture. According to the origin of the lens, it is mainly classified as Japanese lenses and German lenses.

The Japanese lens mainly has a better color reproduction, and the German lens has a strong sense of hierarchy. Chinese lenses in the market are also gradually occupying a certain market, mainly because they are relatively cheap. Prime lenses, as the name suggests, prime lenses do not have a zoom function.

The design of the prime lens is much simpler than that of the zoom lens, but the general zoom lens will have an impact on the imaging during the zoom process, and the biggest advantage of the prime lens over the zoom machine is that the focusing speed is fast and the image quality is stable. Many digital cameras with fixed-focus lenses capture clear and stable images of moving objects, with very accurate focusing, delicate images, very slight graininess, and accurate metering.

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