What is a long and medium focal length lens?
Generally speaking, a focal length of 50mm was close to the normal visual range of the human eye and was considered a medium focal length. In digital cameras, lenses with a focal length of 80mm to 135mm were called medium-range lenses, 135mm and above belonged to telephoto lenses, and lenses with a focal length of 80mm and above were called medium-telephoto lenses. However, the boundaries were not fixed. For example, the focal length of 70 - 200mm was often regarded as a medium telephoto focal length. Many camera manufacturers had lenses with this focal length. Read more exciting novels for free
Long focal length film lens
Long focal length lenses generally referred to photographic lenses larger than 55 millimeters, with focal lengths of tens of millimeters or hundreds of millimeters. In a movie shot, a long focal length lens played a role in weakening the background. It was suitable for shooting distant objects. The angle of view was narrow, the depth of field was short, and the front and back scenes would be compressed into the same plane, losing the three-dimensional sense of depth. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What does a long focal length lens mean?
Usually, a focal length of 50mm was regarded as a medium focal length that was close to the normal visual range of the human eye. In digital cameras, lenses with a focal length of 80 - 135mm were called medium-range lenses, while lenses with a focal length of 135mm and above were considered telephoto lenses. Therefore, medium-telephoto lenses were basically commonly used with focal lengths of 70 - 200. However, this boundary was not absolutely fixed. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
the focal length of a camera lens
The focal length was the division of the focal length of the lens. It was generally divided into super wide angle, wide angle, standard, medium focal length, medium telephoto, telephoto, and super telephoto. Take a 35mm camera (135 camera) as an example: a lens with a focal length below 20mm is an ultra-wide-angle lens; a lens with a focal length of 21mm-40mm is a wide-angle lens; a lens with a focal length of 41mm-60mm is a standard lens; a lens with a focal length of 61mm-100mm is a medium-focal lens; a lens with a focal length of 101mm-180mm is a medium-long focal lens; a lens with a focal length of 180mm-300mm is a telephoto lens; A lens with a focal length of 301mm or above was a super telephoto lens. Different focal lengths had different characteristics and applicable scenes. For example, the ultra-wide angle lens had a wide angle of view, which was suitable for shooting large scenes such as scenery and architecture; the standard lens was close to the human eye's angle of view, with very little distortion, which was more suitable for documentary photography; the telephoto lens could achieve background blurring, compress space, and highlight the main body, but the scene was small, so it was difficult to blend the background with the main body well. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
6mm focal length lens
The 6mm focal length lens had a good balance between field of view and clarity. It not only provided a relatively wide field of view, but also ensured the clarity and details of the picture. The resolution requirement was also relatively moderate. It did not need a high resolution to obtain a satisfactory image quality. He performed particularly well in scenes such as home surveillance and small conference room recording. However, it might still be insufficient in certain situations. In terms of exposure parameters, there were many combinations such as aperture f/5.6, exposure time 1/400, exposure compensation 0EV, etc.(This is only an example combination. There are many different combinations of parameters in practical applications to meet different shooting needs). At the same time, in application scenarios such as monitoring equipment, different 6mm focal length lenses may also be accompanied by other features, such as the horizontal rotation angle of the pan/tilt function of 355°, the vertical rotation angle of 90°, and the visual range of 360°. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What does a long-short focal length lens mean?
The focal length of a lens referred to the distance from the main point of the lens to the focal point. This was an important performance indicator of the lens. According to the length of the focal length of the lens, the lens could be divided into telephoto lens, standard lens, wide-angle lens, and other types. Generally speaking, a long focal length lens had a relatively long focal length, a narrow field of view, a small viewing range, and a small number of scenes. However, each scene occupied a large area in the picture, and it could zoom in on distant scenes so that the distant object would have a larger image on the imaging medium. For example, a long focal length lens was suitable for shooting long-distance pictures, such as shooting a clear moon crater when shooting the moon. A short focal length lens had a shorter focal length, a wider field of view, and a wider viewing range. There were more scenes in the picture, but each scene occupied a small area in the picture. For example, a wide-angle lens could shoot a wide scene at a close distance. The angle of view of a standard lens is about 50 degrees, which is close to the angle of view that a single eye can see without turning the head and eyes. Its imaging effect is basically the same as what we usually see. The focal length of the standard lens of different types of cameras is different. For example, the focal length of the standard lens of a 35mm camera is 40mm, 50mm or 55mm. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
90 focal length lens group photo
When taking group photos, a 90mm focal length lens was a more suitable choice. The standard lens had many advantages when taking group photos, such as the smallest distortion and the closest to the human eye's visual perception. When using a 120 medium format 6×7 camera to take a group photo of more than 500 people, using a 90mm lens could achieve better results. However, when using this focal length lens to take a group photo, one also had to consider other factors such as shooting distance, aperture, shooting time, queue position, etc., in order to take the ideal group photo. For example, it is recommended to choose soft natural light when shooting, such as 9 - 10 a.m. or 4 - 5 p.m.(It needs to be adjusted according to the season and regional differences). It is best to use a cloudy morning, and the direction of the light is best to be in the light. In terms of queue position, when there are more people, they can be arranged in a square array (for example, 50 - 100 people can be arranged in 4 - 5 rows). The height of the front and back rows should be reasonably arranged by chairs, stools, steps, etc. to avoid blocking. It is recommended to use a small aperture such as F11 or F16 (different cameras may have different aperture ranges). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The relationship between the lens and the focal length
The focal length was a key characteristic of a photographic lens. The two were closely related and had many effects on the shooting: * * 1. Relationship between lens type and focal length ** 1. * * Wide-angle lens ** - A lens with a focal length of less than 35mm was a wide-angle lens. This type of lens had a wide angle of view and was suitable for shooting scenery, buildings, and other scenes that required a large angle of view. For example, when taking pictures of vast natural scenery or magnificent buildings, the wide-angle lens could bring more scenes into the picture. 2. * * Standard Shot ** - A lens with a focal length of about 50mm was considered a standard lens. Its angle of view was close to what the human eye could see, and it was often used for portraits and everyday photography. When using a standard lens to shoot a portrait, the proportions and space of the person were more natural. 3. * * Telephoto lens ** - Lenses with a focal length of more than 70mm were considered telephoto lenses and were suitable for long-distance shooting, such as wild animal photography and sports photography. A telephoto lens could make a distant subject look bigger in the picture, as if it was closing the distance between the photographer and the subject. * * 2. The effect of focal length on the lens shooting effect ** 1. * * Perspective * - The shorter the focal length, the wider the angle of view of the lens, allowing it to capture a wider scene. For example, when using a lens with a smaller focal length to shoot a city street, it could cover more street buildings and people. On the contrary, the longer the focal length, the narrower the field of view, which could make distant objects look closer. For example, when a telephoto lens was used to shoot wild animals, it could highlight the main body of the animal while blurring the background. 2. * * In terms of depth of field ** - A lens with a shorter focal length usually has a deeper depth of field, which means that a larger area of the picture will remain clear. This was very useful in landscape photography, such as using a wide-angle lens to shoot a large sea of flowers, from the flowers nearby to the mountains in the distance. The long focal length lens would produce a shallow depth of field, blurring the background and helping to highlight the subject. In portrait photography, the long focal length lens could clearly highlight the main character and blur out the messy background. 3. * * X-ray Transfiguration ** - Wide-angle lenses (short focal length) were prone to perspective distortion, making the object in the picture look farther or flatter than it actually was. For example, when shooting a person at close range with a wide-angle lens, the proportion of the facial features of the person may be out of balance, and the parts close to the lens (such as the nose and mouth) may appear larger than normal. The long focal length lens could better maintain the proportional relationship between the objects and reduce distortion. It was more suitable for shooting scenes that needed to accurately represent the shape of people or objects. * * 3. The relationship between the focal length indicator and the lens type ** - If the focal length label on the lens had two numbers, it meant that the lens was a zoom lens, and its focal length covered the focal length between the two numbers. For example, the 17 - 40mm logo meant that this was a zoom lens, and the focal length varied between 17mm and 40mm. If the focal length indicator on the lens only had one number, it meant that the lens was a fixed-focus lens. For example, a lens with a focal length of 50mm was a fixed-focus lens. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The focal length and characteristics of a photographic lens
The focal length was a measure of the concentration or dispersion of light in an optical system. The distance between the focal point and the center point of the mirror was the focal length, and the unit was "mm." If there was only one number on the lens, it was a fixed-focus lens. If there were two numbers, it was a zoom lens. Lenses with different focal lengths had different characteristics and functions: 1. ** Super wide-angle lens (focal length less than 24mm)**: - [Special characteristic: Large viewing angle] - [Function: It is suitable for shooting large scenes such as scenery and architecture. It can accommodate more elements in the picture, but the proportion of each element in the picture is small. At the same time, it is easy to produce distortion effects. It is difficult to control the effect in close-up shots.] 2. ** 24mm/28mm wide-angle lens **: - [Special characteristic: A wide viewing angle.] - [Function: Commonly used for shooting scenery, architecture, and other large scenes. It can also include many objects, but it may include unnecessary elements during composition, causing the picture to be messy.] 3. ** 35mm-85mm standard lens **: - [Special characteristic: The shooting effect is close to what the human eye can see. It looks natural.] - [Function: It is widely used in portrait shooting, with 35mm, 50mm, and 85mm being common focal lengths.] 4. ** 85mm lens (fixed-focus lens is outstanding in portrait photography)**: - [Special characteristics: Shooting angle of 28 degrees. With a large aperture, the background can be simplified, the character can be highlighted, and the background blurring effect is good. The distance from the whole body to the close-up is about 1.5 meters to 5 meters. The image quality is good, but the angle of view is fixed.] - [Effect: Excellent performance in portrait photography, regarded by many professional photographers as the king of focal length.] 5. ** Telephoto lens above 200mm **: - [Special characteristics: Narrow angle of view, can zoom in on distant objects, can perform a reduction process on the image to eliminate messy elements, has a strong sense of background compression, can make the main body and the background closer in perception, and the longer the focal length, the less obvious the face distortion effect. When shooting a portrait, the facial features will be slightly flattened.] - [Usage: Commonly used for shooting birds, sports events, and other long-distance subjects.] <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What are the characteristics of the focal length of the lens?
The focal length of the lens was as follows: 1. ** Image size **: When shooting the same object at the same distance, the image formed by the lens with a long focal length will be larger, and the image formed by the lens with a short focal length will be smaller. The length of the focal length of the lens determines the size of the image of the object on the imaging medium (film or CCDs, etc.), which is equivalent to the scale of the object and the image. 2. ** Field of view **: The focal length of the lens is inverse to the angle of view. A long focal length and a small angle of view means that a large object can be captured from a long distance. A short focal length and a large angle of view means that a wide range of objects can be captured from a close distance. 3. ** Depth-of-field **: The focal length of the lens is inverse to the depth of field. A long focal length and a small depth of field mean that the clear range of the front and back objects is small; a short focal length and a large depth of field mean that the clear range of the front and back objects is large. 4. ** Picture perspective **: Different focal lengths of the lens will result in different picture perspective effects. For example, the wide-angle lens had a strong perspective, which could emphasize the prospect and highlight the contrast between far and near. The depth of the scene had a strong contraction ratio, and the image had a strong perspective. The telephoto lens had a poor perspective, and the front and back scenes were relatively compact in the image. The proportion of the depth of the scene was reduced, which compressed the depth of the image. 5. ** Distortion **: Different focal lengths have different effects of distortion. For example, wide-angle and ultra-wide-angle lenses had large distortions, especially at the edge of the picture. Among them, fish-eye lenses had "barrel distortion" in other horizontal or vertical scenes except for the center of the picture. Telephoto lenses and ultra-long focal lenses also produced "pillow distortion", that is, the four corners of the picture were stretched out, which would make the object lack three-dimensional sense and become flat. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Car show lens focal length
There were many options for the focal length of the auto show lens. The following were some common ones: 1. ** Telefocal length- 70 - 200**: - The imaging quality was extremely high. At the auto show, when some of the stops did not allow the audience to go on stage, the advantage of the telephoto lens was revealed. This focal length covered a long area, allowing him to attack and defend. He would not miss the opportunity to shoot because of the lack of focal length. He looked professional on the outside, and the models would usually take the initiative to pose when they saw him. 2. ** Fixed focus lens-85mm **: known as the "portrait weapon", with f1.4 and f1.8 focal lengths to choose from. If the budget was sufficient, one could choose an F1.4 model. If the budget was less, one could choose an F1.8 model, which was enough for shooting models. 3. ** Fixed focal lens-50mm **: This focal length fixed-focal lens has a long history. In the last century, it was mass-produced because of its simple design, easy manufacturing, and guaranteed image quality. There were large aperture versions such as f1.4 and f1.8, which were convenient to use when the light was not good. It could provide a range of vision equivalent to that of the human eye. The characters on the screen were stable and square without obvious distortion, but the images might lack impact. 4. ** Fixed focus lens-35mm **: This is also an option for auto show shooting. 5. **14 - 24mm **: For example, Nikon's 14 - 24mm F2.8 lens. The 14mm lens could be used to shoot multiple models and the overall stage effect. For example, the overall effect of shooting the stage + model + car at the auto show was very good. However, the distortion of the 14mm lens was obvious. When shooting a single model, it was necessary to pay attention to placing the upper body (head) of the model in the middle of the picture (the smallest distortion), and the legs were placed at the edge. The overall stretching effect was better, and it was best to cooperate with the beautiful booth to shoot a single model. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>