How to focus the camera

There are two ways to adjust the focal length of the external camera of the desktop:

One is the common manual focusing, and the outer ring in front of the lens can be rotated to fine-tune the focal length.

The other is an autofocus camera, which does not need to adjust the focal length.

The built-in camera of notebook computer is fixed-focus, and the camera can't focus unless you use a peripheral camera connected by USB.

You can use the following methods to adjust the focal length of the computer camera to make it clearer:

1 First of all, when you find that the computer camera is not clear, first adjust the focal length of the camera to see if it is not clear due to the settings of the camera itself. Turn the knob on the front of the camera to adjust the focal length of the camera.

2. The camera driver is not normal. You can download software such as the driver wizard to check or update the computer driver comprehensively. You can rotate the circle on the camera first, which is used to adjust the focal length, and then adjust it to the right. Then use the settings in the self-contained software to set some parameters such as brightness and contrast until you are satisfied.

Extended data:

Methods of setting computer camera parameters:

1, first open the software PotPlayer, and then operate in turn as shown in the figure: turn on the camera/other equipment.

2, and then you can see the picture image from the camera.

3. Then, you can right-click and select Properties to view the resolution of the current camera screen.

4. If you are not satisfied with the current resolution, you can set the resolution of the camera and let it output. Action: Open device settings.

5. Then in the pop-up window, you can set the resolution and encoding format of the camera. It should be noted that UVC cameras can basically support MJPEG format, and some cameras support H.264, YUV and other coding formats.

A, monitoring camera debugging focal length method:

1, turn on the automatic electronic shutter function of the camera, and adjust the lens aperture to the maximum with the controller;

2. Aim the camera at an object 30 meters away and adjust the focal length to infinity;

3. Use the controller to adjust the zoom of the lens to push the scene farthest, and adjust the back intercept of the lens to make the scene clearest;

4. Use the controller to adjust the zoom of the lens to zoom in on the scene, and fine-tune the focal length of the lens to make the scene clearest;

5. Repeat steps 4-5 several times until the scene is always clear when the lens is zoomed.

Second, the focal length of the surveillance camera refers to the distance between the lens and the photosensitive element. The magnification of a lens is approximately equal to the ratio of focal length to object distance. In other words, with the increase of the focal length of the surveillance camera, the magnification increases, which can narrow the close-range and make the details of the distant view clearer.

Extended data:

1. The monitoring camera shall select the focal length of the fixed-focus lens according to the distance from the monitoring camera to the monitored target. From the focal length, there are short focal length wide-angle lens, medium focal length standard lens and long focal length far lens.

The focal length of a lens is usually represented by f, and the aperture of a lens is generally represented by f, and the value of f is measured by the ratio of the focal length of the lens to the aperture d of light, F=f/d, and each lens is marked with its maximum f value.

2. The best focal length for shooting people is 85mm. According to the standard of 35mm, the focal length of a shot is basically 85mm. The portrait taken with a focal length of 85mm is basically close to the picture taken by a medium format camera, which not only has a suitable sense of distance, but also the face of the person looks natural, and the distance between the camera and the person being photographed can basically be kept at the usual speaking distance.

Baidu encyclopedia-monitoring camera

How does a SLR camera focus?

Lead: To learn the skills of shooting short films, we should not only master the shooting skills of still objects, but also master the shooting skills of dynamic objects. Learn from me how to focus a SLR camera. Interested friends learn from me.

First, choose a SLR camera to shoot video and use a tripod to stabilize the picture. When the picture is unstable, the short film shot at any time will become very blurred, and even the real subject can't be seen clearly, which leads to the content in the shot video can't be recorded well, and even shooting is meaningless.

Secondly, for the focus of shooting video, the shooting mode can be adjusted to creative shooting mode, that is, there is a small TV button on the SLR camera, which belongs to real-time shooting mode. Start this button, but it is difficult to shoot short films in basic shooting mode.

When the mode dial is set to the creative shooting mode, the mirror of the SLR camera will sound, and then the image will be displayed on the LCD screen, and you can shoot the picture. When shooting a short film, we should focus on the pictures taken. Auto focus mode is generally adopted. Press the button with a special symbol on the right side of the SLR camera. The special symbol is *. Find this button on the SLR camera, and then press it to adjust the autofocus. The picture will gradually become clear. Don't aim the lens at the sun when taking pictures with autofocus. The heat of the sun will damage some important parts inside the camera.

Click the menu button at the far left of the SLR camera. When the shooting mode is set to short film shooting mode, three autofocus modes will be displayed on the menu, namely, real-time mode, fast mode and face priority mode. For the real-time mode, you can move several direction keys on the left side of the camera, with up, down, left and right keys respectively. When the selected short film screen is to move to the right, at this time, the short film content on the right side of the screen is focused. If you want to adjust the autofocus point to the middle position of the picture, then you can press the delete button in the camera at this time, and it will display the recovery button, which will automatically adjust to the middle position of the picture. Press the meter key, and the meter key is *, which means the meter key. When focusing, you will hear the camera make a sound, and click it, which means you can shoot normally.

For the focus mode with face priority, it also belongs to the range of autofocus mode. Similarly, turning on the shoot button first belongs to the creative mode. Then, when you press it, you will find that the picture comes into your sight, and the face priority mode is usually to shoot faces in a wide range. When some positions of the face are detected, it can be found that a box will appear when focusing. At this time, you can press the left and right keys to adjust. Press the meter key after adjustment, and then focus automatically, and the focused picture will be clearer. When you press a dot button on the left side of real-time shooting mode, you will start recording video, which means shooting video. Click again at the same time, indicating that the video clip is over.

Auto-focusing takes a long time, and it is relatively difficult to focus on the subject on cloudy days or in poor light, so there is another mode: manual focusing to shoot short films. Switch the focus mode of the lens to MF. MF mode belongs to manual focusing and AF mode belongs to automatic focusing. This button is around the lens and is easy to find. Then, select the left and right buttons to move to the appropriate position. You can clearly find the subject in the picture by enlarging the picture button. The zoom-in key is a plus key on the right side of the SLR camera. Every time you zoom in, it is equivalent to magnifying the picture by 5 times, and then pressing the shutter button halfway. At this time, the picture can also be clearly displayed. You can focus by adjusting the position of the lens. When the lens is constantly pushed and pulled, the photo will be clearly displayed, and then it will not move after focusing. Generally, a tripod is used to stabilize the picture, and at the same time, the main content of the short film can be made clearer.

In addition to manual focusing and autofocus shooting short films, it is also necessary to master the time of shooting short films. Generally, video clips shot by SLR cameras can withstand a long time, even between half an hour and 1 hour. SLR cameras can also shoot short films, and can withstand short films of about 20 seconds to 1 minute. It is recommended not to shoot for too long, but for a long time.

When shooting a short film, you can choose a soft light filter to shoot. Using the soft focus filter can make the characters softer under the sunlight, make the picture more dreamy and make the content more meaningful. It is one of my hobbies to practice photography and minor in photography. For professional photographers, it is best to choose a polarizing filter, which can make the colors of photos more vivid, and the clarity of natural photos is the first basic condition.

When the subject is very small, even at the edge of the photo, it is generally difficult to focus. When shooting a short film at high temperature, the camera will automatically remind you of the high temperature. When you make a short film, you will find that the quality of the film is relatively low. Therefore, if you want to choose auto focus mode or manual focus mode to shoot, you need to be flexible. Appropriate cooperation with the hood can better adjust the visual range of the picture.

The method of camera focus adjustment teaches you how to adjust the camera focus.

1. Loosen the fixing screw of the camera's rear focus adjusting ring (some cameras can adjust it directly by adjusting the adjusting screw or the side rear focus adjusting wheel);

2. Adjust the zoom lens to the maximum telephoto position (that is, enlarge the scene), and set the focus with the focus ring on the lens until the image is the clearest;

3. Adjust the zoom lens to the maximum wide angle (wide and short focal length). At this time, the number of millimeters of the lens is the smallest, and the objects seen through the camera are also the smallest. Rotate the back focus adjustment ring until the image is clearest;

4. When switching from telephoto to wide angle, repeat steps 2 and 3 until the image remains in focus. After the setting is completed, tighten the rear focus adjustment ring.

How does Canon 60D adjust the focal length?

1. Step 1 Press the real-time display shooting button on the back of the camera to start the real-time display shooting function.

2. Step 2: Switch the autofocus mode switch of the lens and select the manual mode.

3. Step 3: Adjust the rotatable LCD to an angle that is easier to observe.

4. Step 4: Use the multi-function control key to move the focus to the required focus position.

5. Step 5: Press the zoom button to display an enlarged picture with a magnification of 10.

6. Step 6 Press the shutter button when the image is most clearly displayed.

How does the camera focus?

If you use a vivo phone, the camera will automatically focus when taking pictures; If you need to focus manually, you can focus by clicking on the area to be focused with your finger in the camera interface.

For more questions, please enter vivo official website-My-Online Customer Service-Enter manual consultation online customer service feedback.