What does the lens mean?

Question 1: What does 50mm lens mean? You mean the focal length of the lens, because the focal length of the lens belongs to the basic knowledge of photography. Although it is very simple, there is still a lot to be said from theory to practice to understand. I found some information for you to see: lens focal length: refers to the distance from the main point to the focus after lens optics, which is an important performance index of the lens. The length of the focal length of the lens determines the imaging size, viewing angle, depth of field and viewing angle of the picture.

The focal length of a lens is a very important index of the lens. The focal length of the lens determines the imaging size of the object on the imaging medium (film or CCD, etc.). ), which is equivalent to the proportion of objects and images. When shooting the same subject at the same distance, the image with long lens focal length is large, and the image with short lens focal length is small. According to different uses, the focal length of camera lens varies greatly, from a few millimeters to a dozen millimeters to several meters. Common ones are 8mm, 15mm, 24mm, 28mm, 35mm, 50mm, 85mm, 105mm, 135mm, 200mm, 400mm, 1200mm, etc. And it has a super long focal length of 2500 mm.

According to the length of its focal length, that is, the viewing angle when shooting, the lens can be divided into standard lens, wide-angle lens and long focal length lens.

The viewing angle of a standard lens is about 50 degrees, which is the viewing angle that a person can see with one eye without turning his head and eyes. The feeling observed from the standard lens is basically the same as the scenery we usually see. The standard lens focal length of a 35mm camera is mostly 40mm, 50mm or 55mm. The focal length of the standard lens of 120 camera is generally 80mm or 75 mm. The larger the camera frame, the greater the focal length of the standard lens. However, due to the size of imaging medium (CCD or CMOS) of digital camera, the focal length of standard lens is also inconsistent. In order to facilitate direct perception, when talking about DC lens, the so-called equivalent focal length of 35mm camera is often used, and this equivalence refers to the equivalence in viewing angle. Only the lens of 35mm camera can be compared with other cameras and digital cameras.

Wide-angle lens, as its name implies, has a wide shooting angle and is suitable for shooting scenes with short distance and large range. Sometimes it is used to deliberately exaggerate the foreground performance, with a strong sense of distance and perspective. A typical wide-angle lens of a 35mm camera has a focal length of 28mm and a viewing angle of 72 degrees. Commonly used are the so-called small wide angles of 35mm and 38mm, which are slightly longer than 28mm (more common in fool machines).

Compared with the so-called fisheye lens, the super wide-angle lens (for example, the focal length is 24mm and the viewing angle is 84 degrees) has a focal length of 8mm and the viewing angle can reach 180 degrees.

Long-focus lens is suitable for shooting distant view, with small depth of field, easy to blur the background and highlight the subject. The long focal length lens of a 35mm camera is usually divided into three levels. The lens below 135mm is called medium focal length, such as 85mm, 28-degree viewing angle, 105mm viewing angle, 23-degree viewing angle and 135mm viewing angle. Medium focal length lens is often used to shoot portraits, sometimes called portrait lens. 135-500 is called long focal length, such as 200mm, viewing angle 12 degrees, 400mm, and viewing angle of 6 degrees. More than 500mm is called ultra-long focal length, and the viewing angle is less than 5 degrees, which is suitable for shooting distant view. For example, the close-up on the court and the shooting of wild animals, because it is impossible to get close to the subject, the ultra-long focal length lens is of great use.

What is the definition of lens focal length? Generally speaking, we say: the focal length is the distance from the center of the lens to the focus. But this is only the case of a single thin lens. Because the lens of a camera is composed of many lenses, the situation is far from simple.

Question 2: What does a zoom lens mean? Zoom lens is a kind of camera lens that can change the focal length in a certain range, so as to obtain different field of view angles, different sizes of images and different scene ranges. Zoom lens can change the shooting range by changing the focal length without changing the shooting distance, so it is very beneficial to picture composition. Because a zoom lens can also serve as several fixed-focus lenses, it not only reduces the number of photographic equipment to carry when traveling, but also saves the time for changing lenses.

Question 3: What does the camera mean? It means feet. Indicates the current focal length, which can be used to estimate the focal length. It corresponds to the following meters, but the unit is converted.

The distance scale of zoom lens is inaccurate and can only be used as a reference. Fixed focus lens will be more reliable.

Question 4: What does the USM of SLR camera lens mean? Ultrasonic motor.

Of course, the fuselage is anti-shake. Think about it. No matter what kind of lens it is, as long as it can be installed, it will be unstable.

Yes, Canon's "yes" means that the lens can offset the image blur caused by hand shake within a certain range. Anti-shake function

Ni Kang stands for "VR", which means the function of vibration reduction, and it is the English full name of vibration reduction.

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What does SAM mean after seeing some shots just now? -Sony Super Chicken Wave Motor lens focuses quickly and quietly.

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At present, fuselage anti-shake is mainly concentrated in second-line brands, such as Pentax and Sony. Neither Canon nor Nikon has anti-shake products-right?

Question 5: What do you mean by five beats? Five-beat refers to the pulling, pushing, shaking, moving and following beats used in video and film shooting.

explicitly

Zoom is a photo taken by putting the camera on a moving car and pulling back at a person or scene. As the lens gradually moves away from the main body, the picture gradually unfolds from a part, allowing the audience to move back and see the connection between the part and the whole. The role of pulling the lens: first, pulling the lens is conducive to expressing the relationship between the subject and the subject and the environment; Secondly, the framing range and performance space of the shot-pulling picture are expanding from small to large, which makes the picture composition form the change of multi-structure; Thirdly, shot-pulling is a kind of picture form with vertical spatial variation, which can form contrast, contrast or metaphor in vertical space and vertical orientation through picture images; Fourth, some shots start from the part where it is difficult to infer the overall image, which is conducive to mobilizing the audience's imagination and speculation on the overall image until a complete image is presented; Fifth, the scene changes continuously in a shot, which keeps the integrity and coherence of the picture performance space; Sixth, the internal rhythm of pulling the lens is from tight to loose. Compared with pushing the lens, it can give full play to the emotional aftertaste and produce many subtle feelings. Seventh, pull shots are often used as conclusive and conclusive shots; Eighth, use the pull lens as the transition lens. For example, the picture begins with a reporter's report and ends with a traffic accident scene, which shows that the reporter is doing a live report on the accident scene. If the same scene continues to be pulled out and a family is watching this TV program, it seems that the focus of this report has shifted to the family's concern about this matter. In fact, only when the picture finally appears in a specific environment can the overall meaning of the picture be completed. It can be seen that the left picture with lens is the key to reveal the meaning of the picture.

Push lens is a shooting method that puts the camera on the moving car and pushes it forward towards the shooting object and the shot picture. When the lens moves forward, the subject gradually becomes larger in the picture, guiding the audience's attention to the part to be shown. The role of pushing the lens: first, highlight the main characters and highlight the key images; When the lens is pushed to the subject, the field of view ranges from large to small. As the minor part moves out of the picture, the main part to be shown gradually "enlarges" and fills the picture, so it has the function of highlighting the main characters and key images. Second, highlight the details and highlight the important plot factors; Pushing the lens can start from a larger picture range and visual field space, and gradually approach a detailed image in this picture and space. The visual signal of this detail image is from weak to strong, and the changes brought by this action guide the audience to pay attention to this detail. In the push shot, the audience can see the whole picture and the related details in the left picture, and can perceive the connection and relationship between details and things, which makes up for the lack of a single detail close-up picture. Third, introduce the relationship between the whole and the part, the objective environment and the main characters in one shot; Fourth, the scene of the shot is constantly changing in one shot, which has the function of montage sentences continuously; Progressive montage assembly is an assembly method in which a large scene jumps to a small scene step by step, which has a gradual effect and function on the performance of things. Fifth, the speed of pushing the lens can affect and adjust the rhythm of the picture, thus producing externalized emotional power; 6. Pushing the lens can express a specific theme and significance by highlighting an important drama element; In film and television dramas, pushing the lens can highlight the events that lead to * * * and weaken the movement of the subject through the unique modeling form of the screen language. Seven, pushing the lens can strengthen or weaken the movement of the subject.

Translation is a TV lens language produced by translation. When shooting the lens, the camera position does not move, only the fuselage rotates up and down and left and right. The role of panning: first, show the space and expand the field of vision; Second, it is beneficial to contain more visual information through small scenes; Thirdly, it can introduce and explain the internal relationship between the two subjects in the same scene; Fourthly, two subjects with opposite or similar nature and meaning are connected by shaking the lens to express some metaphor, contrast, juxtaposition and causality; Fifth, it is convenient to display the dynamics, dynamic situation, movement direction and trajectory of the moving subject; Sixth, you can use the image of the shaking accident of the shaking lens to create suspense and form the ups and downs of visual attention in a shot; Seventh, use non-horizontal oblique shaking and rotary shaking to express specific emotions and atmosphere. In class, friendship movies used this from the beginning.

Question 6: What does a standard lens mean? A standard lens refers to a lens whose horizontal viewing angle is approximately the same as the area that can be clearly seen by human eyes. For 135 camera or Quan Huafu digital camera, a lens of about 50mm is called a standard lens. The photos taken by the standard lens have a perspective effect close to what the human eye can see, and the picture is dull and more realistic. 24- 105 focal length is practical, with anti-shake, slightly smaller aperture, good imaging quality of 24-70, and no anti-shake at large aperture. Choose 24-70 which pays attention to imaging quality and 24- 105 which pays attention to economy and application.

Question 7: What does the number of Canon lenses mean? It seems that you are a novice. Let me give you a general introduction, which may not be absorbed at once.

The number on the lens refers to the focal length. There are two kinds of lenses, zoom lens and fixed focus lens.

For example, 24-70 and 18- 135 are zoom lenses, which can be changed from 24 to 70, and 18 to 135. Novices commonly say: the farther you shoot, the closer you shoot, and that's what it depends on.

Some lenses, such as 50, 85, 35 and A number, are fixed-focus lenses.

The smaller the number, the wider the angle, that is, the wide angle.

The bigger the number, the narrower the angle (which makes you feel far), that is, telephoto.

So does the second one bring the distant object closer than the first one? Yes, I see farther and farther.

3. For example, how about 24-70 18- 135?

Depends on what you ask.

Of course, the imaging is 24-70, and the second generation is18-1350,000 streets, especially the second generation is 24-70.

Of course, the price is 18- 135.

Of course, the scope of application is 24-70, which can shoot all Canon SLR bodies. 18- 135 only in APS-C fuselage, EF-S lens.

The aperture is of course a constant large aperture of 24-70 F2.8. 18- 135 unstable

Of course, the motor 24-70 USM ultrasonic motor 18- 135 is the most expensive, and it is STM motor.

Of course, the working material is 24-70, so how can a big ternary red circle be compared with a dog's head?

How did 4.24 become wide-angle?

As mentioned above, the smaller the number, the wider the angle. Why is 18- 135 not as wide as 24-70? We need an explanation. (It may be complicated. Let me give an example of a 50mm lens. )

Installing a 50mm lens on a traditional 135 film camera (the film is about 36X24mm) brings a field of vision almost similar to that of the human eye (except for the residual light) (it is really 58mm similar to that of the human eye). So 50 is called a standard lens.

The film size of this camera is basically the same as that of Quan Huafu in the digital age (5D, 5D2, 5D3, 6D,).

However, the size of the machine negatives of 500 D, 60 D and 70 D is only about 24X 16mm, so a 50mm lens is also installed, because the photosensitive element is one size smaller, and the surrounding image field does not exist. In fact, from another angle, it is to shoot farther and farther. (for example, take a picture of a person's whole body, and finally cut off a circle of photos around him. Is the rest similar to going further? )

Therefore, after installing 50mm on this APS-C, the multiple of X 1.6 is needed, which is determined by the size of the photosensitive element. So it becomes 80 after 50X 1.6. It is different to install the same lens on Quan Huafu and APS-C.

3. As mentioned above, 18- 135 can only be given to APS-C, and 24-70 can be given to all models.

Then the effect of 24-70+ Quan Huafu = 24-70.

18- 135+APS-C = actually it should be X 1.6 = 28.8-2 16d.

4. So it is very convenient to find a wide angle on Quan Huafu and a telephoto on APS-C, so some SLR cameras positioned as sports and outdoor photography models are not from Quan Huafu, just to get a longer telephoto.

5. I'm 500d now, and I want to update my machine, but I think 70 d and 60 d are basically the same. What's the difference?

The difference is big. The gap between 60D and 500D is big enough, not to mention 70D.

First of all, the 500D itself is an entry-level positioning, which will control the overall workmanship and size.

Secondly, they are completely different in processor speed, focusing system, continuous shooting speed and photosensitive element performance. After all, not the same generation.

In addition, I think the most important thing to buy a SLR is the picture quality. If the SLR does not have good image quality, it is nothing more than an ergonomic problem. Buying 18-55, 18- 135, 18-200 SLR is a complete waste of money, and any good body will be dragged down by this lens.

It is a good choice to buy APS-C lens at least 15-85. After conversion, it is 24- 136, with wide focal length and wide angle, and the imaging is passable.

Therefore, the biggest problem in the landlord's hand is to change the lens to 15-85 first. It is suggested that the fuselage should be considered for 70D, or not changed. There is no need to upgrade to 60 d. I hope it will help you all the time.

...& gt& gt

Question 8: What does Canon lens AFMF mean? AF means autofocus, which means autofocus. Focusing means that the camera measures the distance between the subject and the camera. MF: Manual focusing is manual focusing. If the camera is allowed to focus automatically, sometimes the surrounding environment may not be very accurate. At this time, people who have experience in Yan Dan will choose manual focusing to take better photos.

Question 9: What does it mean to make a movie "one shot"? In the middle is a continuous image. For example, in a movie, there is a flower in the picture first, then the picture switches to a girl's face, and then the girl from a distance crouches among the flowers. Then the part of the girl's face is counted as a shot, the previous one is counted as a shot, and so on ... Note that if the picture is not switched, but moved from the flower to the girl's face, it can only be counted as the same shot.

Question 10: What do D lens and G lens mean in SLR lens? The film format of dual-lens reflex camera is 120. Because of the large area of film pasting, the imaging quality is very high. The two lenses are distributed up and down, and the upper lens is shot in the next account, which has parallax. By placing different pictures in the camera darkroom, we can shoot films with the aspect ratio of 6×6 or 6×4.5(cm). The most famous cameras in China are the German Luffalaise and the Japanese IELTS card. In addition, the Pearl River brand 120 dual-lens reflex camera produced by Guangzhou Camera Factory in the 1970s was copied from Lulaifu. In the past, the largest domestic sales volume was the Seagull brand 4-series double reflex camera produced by Shanghai Camera Factory. Nikon began to produce D-lens as early as 20 years ago. Through the electronic signal contacts on the lens, it can transmit information such as photometry, contrast and focusing distance to the SLR body. With Nikon's professional flash, it can realize automatic photometry focusing, flash ranging, flash and other functions. However, this series of lenses has no mirror motor and can only be used on Nikon SLR cameras with body motors. G-series lenses cancel the aperture adjustment ring, but not all G-series lenses have built-in motors. These lenses can only be used on Nikon's new SLR.