What are the main structures of a camera lens

The lens structure is mainly divided into lens body, lens, zoom ring, focus ring, aperture blade, and some anti-shake systems, the most important of which is the lens, also called the lens

A lens is often made up of multiple lenses, which are grouped together as needed to reproduce the subject as clearly and accurately as possible.

The structure of a lens mainly refers to the number of lenses that make up a lens. Since the technology used by different manufacturers and different products is different, it is not simply better to think that the number of lenses is better or the number is less! The number of lenses for different lenses is indicated by numbers, so you can see them at a glance.

For example, "Canon EF28-105 is identified as 15 elements in 12 groups, which means that this lens has a total of 15 lenses, and these 15 lenses are divided into 12 lens groups, some are in a group of 1 element, and some are in groups of two elements to achieve different functions.

1. Center composition method.

There is a technique of highlighting the subject in the photographic composition, called the central composition method, which can well highlight the object to be highlighted very vividly, especially when close-up people and an object, this technique is often used, the prominent object such as people and objects is in the middle, and the other backgrounds are balanced left and right.

2. Symmetrical composition method.

Chinese like symmetrical beauty, so sometimes some scenes can try symmetrical composition techniques, according to the symmetry point of the scene in the picture, add the ** not symmetrical in the early stage, you can also crop in the later stage, complete the object, this technique is often used in highways, water reflections, architecture, etc.

3. Vertical line composition method.

The picture of this technique is mainly based on vertical lines, and is mostly used in places with trees, flagpoles, vertical buildings, pillars, etc., and is a straight.

Vertical lines are taken to take pictures that retain the characteristics of the object itself.

4. Frame composition method.

Focusing on the picture in a certain frame, such as shooting people outside through the car window, and shooting people inside and outside the door through the door, this frame composition method is to put people and scenery in a range, and everyone's eyes will be guided to the scene in the frame, and there is a feeling of entering the picture. What we should pay attention to is to highlight the relationship between light and dark!

5. Horizontal line composition method.

This horizontal line composition method is the most basic and the most commonly used basic composition method in daily life, which is generally based on the horizontal line of the scene as a reference, and uses relatively horizontal lines to show the breadth of the scene and the harmony of the picture. It is more suitable for shooting water surfaces, plains, grasslands and other places.

6. Nine-square grid composition method.

This method of nine-square grid composition has recently been in the circle of friends.

It is very popular, and it is also called tic-tac-toe composition. Even photographers and those who work in art such as design like to use this method, two vertical lines and two horizontal lines to divide the whole picture into 9 parts, obtain 4 intersecting key points, and place the focus to be highlighted on one point of these 4 intersections of the picture, of course, it can also be multiple points.

7. S-shaped composition method.

On the way to travel, there will be some scenery on the picture that is S-shaped, such as some flowers walking, some Xiao Qiao.

River, some S-bend walkway, the scenery is in the form of S-shaped curve composition, so that people look energetic and rhythmic, S-shape not only has the advantages of curves, when our eyes move to the depth with the S-shape, it can also be a very powerful expression of the sense of space and depth of the scene.

8. Diagonal composition method.

Put the object you want to shoot on the diagonal line of the composition picture, this is the diagonal composition method, this kind of photography technique can effectively place the subject on the diagonal line of the picture, which can effectively attract people's eyes and achieve the effect of the subject prominence.

9. Repeated composition method.

When a picture is the same object, that is to say, the picture is monotonous and unified, this can be used to repeat the composition method, and keep the whole composition of the picture is this subject, so that we can play the subject we want to highlight.

Camera lenses are divided into zoom lenses and prime lenses.

A camera, abbreviated as a camera, is a device that uses the principle of optical imaging to form an image and record it with a negative. Many devices that can record images have the characteristics of a camera. Medical imaging equipment, astronomical observation equipment, etc.

A camera is an optical device used for photography. After the light reflected by the subject is focused through the photographic lens (camera objective) and the shutter that controls the amount of **, the subject forms a latent image on the photosensitive material in the camera obscura, and then processes (i.e., developing, fixing) to form a permanent image, which is called photography.

A digital camera is a type of camera that uses an electronic sensor to convert optical images into electronic data. Unlike ordinary cameras, which rely on the chemical changes of silver bromide on film to record images, the sensor of digital cameras is an optical-inductive charge-coupled or complementary metal-oxide-semiconductor (CMOS). Images are usually stored in a digital storage device before they are transferred to a computer.

Digital cameras are optical, mechanical, and electronic products. It integrates the conversion, storage and transmission of image information, and has the characteristics of digital access mode, interactive processing with computer and real-time shooting.

Focal length is an important parameter of the optical lens, when a beam of parallel light passes through the convex lens along the principal axis direction of the convex lens, it will converge into a point on the main axis on the other side of the convex lens, which is called the focal point, and the distance from the focal point to the optical center of the convex lens is called the focal length of the convex lens. A photographic lens, like a convex lens, also has standard, long, and short focal lengths.

The length of the focal length = the diagonal of the imaging frame is called the diagonal of the 135 camera, the diagonal of the 135 camera's frame is 58mm, and the 120 camera's is 58mm. The format diagonal is 75mm, and its standard lens is 75mm; Those that are longer than a standard lens are called long focal length lenses, and those that are shorter than standard lenses are called short focal length lenses.

Lenses with different focal lengths have different styling characteristics, such as short focal length lenses have the characteristics of wide viewing angle, large depth of field, large perspective effect, and small image. These characteristics are used in the creation of the means of modeling.

A lens with variable focal length is called a zoom lens, and the ratio of the shortest focal length to the longest focal length is called the zoom factor of a zoom lens. The larger the zoom factor, the more significant the change in the field at the same shooting distance.

From the perspective of focal length, lenses with wide angles and large zoom multiples are the best, mainly used in professional photography, and the cost is also the most expensive.

1. According to the focal length or field of view of the lens, the lens is divided into three categories: standard lens, short-throw (wide-angle) lens, and telephoto (telephoto) lens. Because the focal length, field of view, shooting range, depth of field, and image size obtained at the same shooting distance are relatively moderate, this lens is the most widely used, and is most suitable for shooting portraits, landscapes, life and other kinds.

2. According to the light gathering ability of the lens, it is divided into: ultra-transmittance lens, and the size of the relative aperture of the photographic objective lens should reach above; Strong light transmittance lens wax rotten,; Normal Hidden Light Transmission Force Lens,:9;Weak light transmission lens, less than 1:9.

3. According to whether the focal length of the lens can be changed, it can be divided into two categories: fixed focal length lens and zoom lens.

1. Wide-angle lens.

A wide-angle lens in this sense refers to a lens with a focal length of less than 35mm, such as a 28mm, 24mm, or even 16mm lens. Generally speaking, lenses under 24mm are called ultra-wide-angle lenses. The focal length of the lens has to be multiplied by or, so for this type of SLR, 16mm can be considered an ultra-wide-angle lens.

2. Standard lens.

Generally speaking, the focal length of the lens is 50mm or the angle of view of the lens is closest to the human eye, but only because of this, it is difficult to use the header well, because it is not like ultra-wide angle or macro lenses, which can shoot images that cannot be perceived by the human eye. The 85mm lens is generally a portrait lens.

3. Medium telephoto lens.

Generally, the lifting hail is 100mm or 135mm. Among them, the 100mm lens is generally a macro lens, and the 135mm lens is also a portrait lens, but it focuses on semi-handy portraits, while 85mm focuses more on full-body portraits.