One: The difference between a camera and a video camera:

1: In China, there is a strict distinction between cameras, cameras and cameras. A camera refers to a machine that shoots movies with film. A camera is a machine that records moving images with magnetic tapes, optical disks, hard disks, etc. , widely used in TV program production, family and so on. The camera uses film and mechanical devices to record moving images, uses optical and chemical recording methods, and uses electronic recording methods. Cameras and camcorders record in the same way, but the recorded images are fixed.

2. One is magnetic recording and the other is photochemical recording, which is the most essential difference!

3. A camera refers to a device that uses film to shoot dynamic pictures. Its mechanical mechanism is complex, the development and printing process is tedious, but the effect is unparalleled. It's for filming. (Of course, there is also glue for magnetism. ) imaging is a chemical reaction, using film. ..

The camera uses magnetic recording, that is, the recording medium can be reused, with high efficiency and low cost, but the effect and accuracy are much worse than that of film shooting. It's for TV. It is a concept of photoelectric conversion. The recording medium is a digital recording tape. ..

With the emergence and continuous development of high-definition cameras, the difference between photography and video recording has indeed become smaller and smaller, but the principle of photography and video recording will never change!

Second, the types of film cameras

Movie cameras are mainly used to shoot and record moving or still images. It is a kind of precision mechanical equipment which integrates the knowledge and research results of optics, machinery, electronics, electrician, electroacoustic, chemistry and other disciplines.

Film cameras can be divided into three types: large, medium and small.

According to the membrane width, it can be divided into 70 mm, 50 mm, 35 mm, 16 mm, 8.75 mm and 8 mm.

According to the purpose, it can be divided into stunt cameras, high-speed cameras, subtitle cameras, time-delay cameras, microscopic cameras, underwater cameras and aerial cameras.

In recent years, film cameras are mainly developing towards portability, miniaturization, low noise and automation. At present, 16 mm camera is widely used in filming teaching films.

Third, the structure of the film camera.

A movie camera is generally composed of a lens, a body, a cassette and a driving motor.

For a camera, the lens is its main component. Its function is to make the subject clearly imaged. Therefore, its lens is required to have a high standard of clarity and maximum light transmittance. Generally speaking, the focal length of the standard lens of a movie camera is about twice the diagonal of the picture, and its horizontal viewing angle is 24. Professional cameras often have several interchangeable lenses with different focal lengths, such as wide-angle lens, telephoto lens and standard lens. Nowadays, many movie cameras are equipped with zoom lenses, which is much more convenient to use.

Film cameras actually shoot a series of still images. When the film is in the window, it must be still to expose it, just like a camera, then move the film so that the lower part of the film is aligned with the window, and so on. The key component of this part of the camera is its intermittent mechanism. There is a shutter in the intermittent mechanism, which can block the light at the appropriate moment of each intermittent period. Shutters generally use a turntable with a fan-shaped opening angle, so that the light emitted by the lens can be projected onto the film still in the film window. When the opaque sector mask on the shutter blocks the light, the film starts to move under the drive of the intermittent mechanism, and is stabilized at the exposure position again. The continuous motion of the film in the camera is driven by the film conveying gear, and the teeth on the rim mesh with the film hole. There is a set of pinch rollers outside the gear, which makes the film contact with the gear well and prevents the film from falling off the teeth.

There is a certain route for the film to run in the camera, which requires not only to ensure the accurate and safe operation of the film, but also to make the operator change the film quickly. On the film running line, besides a pair of retractable sheeting pulleys on the main transmission gear, there are pulleys to guide the film into and out of intermittent motion. The device that supplies the camera with film and rolls up the exposed film is called a film cassette. Most of them are installed on the upper part of the fuselage, and the two film rooms of the cassette must be completely opaque. Film loading must be done in a dark room. Usually, the film factory loads the whole film, leaving a section of the film tail exposed outside the film box through the light-proof channel of the film box. After the camera is mounted in the dark box, the film can pass through the film channel of the camera, and then the film tail can pass through the opaque channel of the film receiving box, so that it can be wound on the shaft core of the film receiving shaft. The whole film loading process is just like loading a camera with film, but the former is more complicated.

The cassette used in 16 mm camera is different from the double cassette used in general cameras. This is a two-chamber cassette, driven by the same gear, and has two parts for film supply and film winding. To rotate the camera, there must be a driving part, usually a motor or clockwork. If motor drive is used, there are interchangeable types of motors to meet different needs. In order to make the exposure consistent, the camera must run stably. When recording at the same time, the camera should control its running speed more accurately.

Generally speaking, a digital camera is mainly composed of five parts, namely, a framing system, a control system, an imaging system, a storage system and a power supply. Let's have a brief look at digital cameras.

First, the frame system

The framing system is composed of related components of digital cameras to obtain images, and its function is to let photographers see the audio and video shot through them. There are similarities and differences between digital cameras and traditional cameras. The same is through the lens and viewfinder, the difference is that digital cameras can use LCD screen to view.

Second, the control system

The control system is composed of controllable components of digital camera, and its function is to make the image focus clearer, the exposure more accurate, the color more realistic and completely preserved through manipulation.

Third, the playback system.

The playback system is used to play the recorded images, and can perform operations such as fast rewind, fast forward and playback.

Fourth, the storage system

The storage system can be divided into two parts. One part is a video tape for video recording, which is a high-density information storage and conversion medium. At present, 8 mm video tape is widely used in digital cameras, which has a direct impact on the quality of recorded and played back signals during magnetic recording and playback. Video tape has always been the mainstream product in recording media, but at present some cameras use new recording media, such as DVD-RAM and hard disk. The second is a memory card for recording digital photos, and a digital camera is used to shoot still images. Like the memory card of a digital camera, it can be used to take photos, and when necessary, it can exchange image data with computers and other devices through USB cables connected to the camera.

Installation of video tape. The video tape is loaded from the bottom of the camera, and its operation steps are as follows: first, turn on the power supply; Then lay the camera flat, and then push the open/eject switch in the direction of the arrow to open the cover. At this time, the video cabin automatically rises and opens, as shown in Figure 7. Push the middle part of the back of the video tape to be loaded, and pay attention to insert the video tape window outward into the bottom of the video tape box; Finally, the PUSH sign on the video cabin closes the video cabin. When the video cabin is completely lowered, close the cover to make it click.

It is best to process the video before using it. Formatting DV video tape is necessary for batch acquisition and accurate time code search. Formatting here means recording a "blank" video from beginning to end without interruption. Professional photographers will do this for the new DV video. After formatting, you can start shooting video. In this way, when you play a video script on a DV camera, the counter (which will be displayed as a time code on the LCD screen or viewing window of the camera) will continue to increase, even if there is no video.

Verb (abbreviation of verb) power supply system

The DC power supply used by the camera is a sealed battery, which avoids the problems of liquid leakage and air leakage and is very safe to use. At the same time, because it can be charged for more than 300 times, it has long service life and is flexible and convenient to use. It can avoid the limitation of the power connection line when using AC power supply, and make shooting more free, especially when taking pictures outdoors, rechargeable batteries are an essential power supply. In addition, the general camera also provides a socket directly connected to the AC power supply. When using the camera indoors, you can use AC power supply.

The battery is the power supply of the camera, and this step is essential. If shooting indoors, you can connect the AC power supply with the power cord and AC power converter. At this point, you can connect the AC power adapter first, then open the DCIN jack cover and insert one end of the cable. If shooting outdoors, you need to use rechargeable batteries as power supply. At this time, you just need to lift the viewfinder, push the battery along the battery slot until it clicks, and then put down the viewfinder. As shown in fig. 8. If you want to take out the battery, just lift the viewfinder, then press the battery release button, and then take out the battery.

Prepare more batteries before shooting to ensure that the batteries are used up when shooting, so as to prevent every precious moment from being missed. Even if one battery is enough for video recording, just in case, prepare another battery. When charging, use the connecting cable to insert the charging interface.

For beginners, DV is still a relatively new thing, so try to read the user manual before using it. Of course, you can also find some books about DV. For example, the book "Digital Camera from Entry to Mastery" is good. This is a book introducing DV shooting, DV usage, shooting scheme and post-editing. Its most attractive are 26 creative shooting schemes such as Chinese New Year, wedding, birthday, children's documentary, graduation ceremony, school sports meeting and personal video resume. , can let the majority of DV users refer to shoot a perfect small movie. You might as well find one.

Explain the purpose, why and how to use the camera.

Oh, for professional use. Generally used in advertising and landscape photography, ordinary people simply don't need it. Professional magazines and the like are used a lot. This kind of billboard is mainly large in size and picture, which is clear to the people. This kind of camera can't shoot with such high definition. Can you understand?

What's the difference between a video camera and a video camera?

1, different shutters:

Cameras use continuous shutters to record information on dynamic film (this is a traditional camera).

A camera, commonly referred to as a camera, records a single frame image on a storage medium through a single shutter.

2. Different purposes:

Camera refers to the machine that shoots movies with film, which is developed for film application.

Camera, a camera is a machine that records moving images with tapes, CDs, hard disks, etc. It was developed for TV applications. Widely used in TV program production, family and so on.

3, the principle is different:

The camera adopts optical and chemical recording methods. It is a device that records images by using optical principle.

This camera is recorded electronically. Convert optical image signals into electrical signals for storage or transmission.

Extended data

Matters needing attention in camera maintenance

First of all, cameras are often used in our daily life. We should avoid touching the lens of the camera when using it, and avoid the LCD screen being collided when using it. At the same time, try to avoid shaking the camera violently, especially when running around and jumping, which is easy to damage the camera.

Second, everyone should learn to maintain the camera when using it. When we go out to use the camera, we should try to avoid shooting in rainy days, and don't choose to shoot in snowy days, because such an environment is likely to damage the chip inside the camera.

Third, when not using the camera, use a special camera bag. Everyone should put the camera and other parts of the camera in the bag, then close the bag first and put the camera bag in a dry place, which is good for the camera.

Fourth, when using the camera outdoors, we should pay attention to the placement environment. In particular, do not expose the LCD screen, viewfinder and lens to direct sunlight for a long time, which may easily cause explosion. This kind of thing has happened a lot, so we should be vigilant.

Fifth, we should also pay attention to the maintenance of camera batteries. Generally, try to fully charge the battery when shooting, continue to fully charge it after use, and then put it away. In addition, when using the camera for a long time, it is best to use an AC power converter to supply power from a wall socket.

References:

Baidu encyclopedia camera

References:

Baidu encyclopedia camera

What's the use of digital cameras?

The function of digital camera is mainly to record or create movies, which is the same as traditional film camera, but the cost is lower and the use is more convenient. According to different professional levels, the classification and functions of digital cameras are as follows:

1, broadcast type number:

These models are mainly used in the field of radio and television, with high image quality and good comprehensive performance, but digital cameras are expensive, bulky, with the highest definition and the largest signal-to-noise ratio. Of course, the price of several hundred thousand yuan is not acceptable to ordinary people.

2. Professional models:

These models are generally used in professional TV fields other than radio and television, such as audio-visual education, and the picture quality is lower than that of broadcast cameras. However, in recent years, some high-end professional cameras have surpassed the old models of broadcast cameras in many aspects, such as performance indicators, and the prices are generally between tens of thousands and hundreds of thousands of yuan.

Compared with consumer models, professional DV is not only cooler and more eye-catching, but also much higher in configuration, such as using lenses with better quality and performance and larger CCD, which is more prominent in imaging quality and adaptability to the environment.

3. Consumer model:

This kind of camera is mainly suitable for home use, and it is used in non-business occasions where the image quality is not high, such as home entertainment. This kind of camera is small in size, light in weight, easy to carry, simple to operate and cheap. It can be used to make VCD and DVD for personal families in low-demand occasions, and the price is generally in the order of several thousand yuan to ten thousand yuan.

High-speed cameras are favored by photographers, so what role does it play in daily life?

High-speed cameras are generally used to photograph the flight trajectory of bullets or shells, or high-speed mechanical instruments. They are used in other scientific experiments, mainly for scientific research, and are hardly needed in daily life.

Generally, the experiment of studying supersonic gas jet needs high-definition high-speed camera to shoot, and the memory is large, so the domestic high-speed camera is fully competent.

The high-speed camera needs to be used with the control computer. The control software of high-speed camera is installed in the control computer and connected with the high-speed camera through gigabit network cable, which can realize the post-processing work of high-speed camera operation control, real-time viewing of video images, data download, video format conversion and so on.

When we are outdoors or unable to connect to the computer, we can choose LCD viewfinder and control handle instead of controlling the computer.

The memory size in the configuration parameters of high-speed camera is an important parameter to measure the recording time of a single shot. Memory is not used to store data for a long time, but to download the data in the memory of high-speed camera to the computer for storage after shooting.

High-speed cameras are different from ordinary cameras. The main purpose of high-speed camera is to capture the moment of events, but it cannot be used for long-term recording. We choose different trigger methods to capture instantaneous images that are difficult for human eyes to capture.

To choose a suitable high-speed camera, we usually need to know what the shooting application is, such as the shooting space range and the moving speed of the subject, so as to determine how much resolution and frame rate are needed when shooting. At the same time, many factors such as shooting environment will affect the selection of high-speed cameras and accessories needed for shooting.

The price of high-speed cameras is much more expensive than ordinary everyday cameras. If you want to buy a high-speed camera, the usual practice is to make an offer after selecting it according to the actual application. The whole process is as follows: Toilet Toilet Toilet Toilet Toilet Toilet Toilet Toilet Toilet Toilet Toilet Toilet Toilet Toilet Toilet Toilet Toilet Toilet Toilet Dixian (1) is idle.

Shanghai Weice provides testing and experimental equipment, systems, software and related solutions for automobile, military industry, aerospace, scientific research and education, and auto parts factory. Over the years, the technical team has been sent abroad to learn advanced product technical expertise to ensure timely feedback and solution of problems. The service center is equipped with supporting parts, equipment and maintenance tools, which reduces the frequency of overseas maintenance and saves time and cost.

end