Please let me know what is the optical zoom of the camera, thank you

Optical zoom is known as optical zoom in English, and digital cameras rely on an optical lens structure to achieve zoom. The optical zoom method of a digital camera is similar to that of a traditional 35mm camera, that is, the lens movement is used to zoom in and out of the scene to be photographed, and the larger the optical zoom factor, the farther the scene can be captured.

What does lens focal length mean? What is a standard lens? What is a Telephoto Lens? What is a short throw lens? What is a zoom lens? What are the uses, advantages and disadvantages of each?

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 standard lens of the 135 camera, the diagonal of the frame of the 135 camera is 58mm, and the diagonal of the frame of the 120 camera is 75mm, and the standard lens is 75mm; Those that are longer than the standard lens are called long focal length lenses, and those that are shorter than the standard lens 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.

Optical zoom. It is the effect of the vertical change of the position of the object, the focus and the lens, which is mainly manifested in the feeling that the object is progressing.

1.The principle of optical zoom is that the camera changes the size of the image after changing the focal length. In an optically zoom camera, the sensor is fixed and then the lens is moved, which is equivalent to the focus shifting.

As the focus shifts, the distance of the sensor also changes, which causes a change in focal length, which in turn leads to a change in image size.

2.The biggest feature of optical zoom is that the pixels do not change after the image is enlarged. Optical zoom only changes the distance that the optical fiber transmits, and the light itself does not change.

It's like a person, there is no change after walking a thousand meters and walking two kilometers. Since the light does not change, the image presented after the focal length changes does not change either.

3.In addition to optical zoom, there is also digital zoom in the camera. The most basic principle of digital zoom is to enlarge a fixed **.

In general, optical zoom is equivalent to zooming in directly to bring the object closer so that you can see more clearly, while digital zoom is just equivalent to enlarging a photo that has already been taken.

Optical zoom is to change the focal length of the lens by changing the relative disturbance position of each lens in the zoom lens, which is a real judder zoom.

The optical zoom function is used when the photographer does not want to change or cannot easily adjust the distance between the lens and the subject. For example, it is possible to capture the natural demeanor from a distance without the subject noticing, or to zoom in on distant objects.

Optical zoom does not affect the sharpness, and digital zoom is, to put it bluntly, the magnification of the image quality.

Optical Zoom Optical zoom is created by a change in the position of the lens, the object, and the focal point. When the imaging surface moves horizontally, the vision and focal length change, and the farther scenery becomes clearer, giving the impression that the object is progressing. Obviously, there must be two ways to change the angle of view, one is to change the focal length of the lens.

In photographic parlance, this is optical zoom. The focal length of the lens is changed by changing the relative position of the lenses in the zoom lens. So we see that some digital cameras with longer lenses and sensors have more room to move inside, so the zoom factor is also larger.

The optical zoom factor of the home camcorder is 10x to 22x, and it can shoot things up to 70 meters away relatively clearly. The use of a magnifier increases the optical zoom factor of the camcorder. If the optical zoom factor is not enough, we can add a magnifier in front of the lens, the calculation method is like this, a Xiangye 2x teleconverter, set on a digital video camera with 4x optical zoom, then the optical zoom factor of this digital camera is changed from the original 1x, 2x, 3x, 4x to 2x, 4x, 6x and 8x, that is, the multiplier of the teleconverter and the optical zoom factor are multiplied.

The principle of optical zoom is to change the size of an image by changing the size of the focal length. Inside the optical zoom camera lens, there are lenses that can be moved. The image sensor behind the camera is fixed, and when the lens moves, the focus is moving.

As the focus shifts, the distance to the sensor behind changes and the focal length changes. When the focal length changes, the size of the image changes. So it can be explained in unprofessional but relatively easy to understand words, that optical zoom only changes the distance at which the light travels, and the light itself does not change.

It's like a person, there is no change after walking a thousand meters and walking two kilometers. (Although walking more can **, but here we will ignore the fat burned for the first kilometer for the time being!) Light also attenuates as it travels farther distances, but camera lenses are generally short, so let's ignore this attenuation for now) Since the light does not change, the image presented after the focal length changes also does not change.

Therefore, the biggest feature of optical zoom is that the pixels of the image will not change after magnification, that is, the picture will not be affected.

In fact, the most basic principle of digital zoom is to carry out a fixed ** method. If you still don't understand, then take out your phone, click on a **, and then zoom in and ....... This magnification process is called digital zoom.

What do you think? What technicians want to do with their heads, you can do it with your hands, is there a sense of accomplishment! When you put it very large, the whole screen may only be able to see a part of the original **.

This part will become more and more blurry as you zoom in. Because digital ** is composed of pixels, it can be seen as composed of small dots or small squares. There is a gap between these blocks.

In the original **, this spacing is too small for us to detect with the naked eye, so the whole picture looks relatively beautiful. However, as it gradually zooms in, the spacing between pixels and the pixels are also enlarged. This not only looks blurry, but also very stiff to the naked eye.

So digital zoom will damage the image quality. In the process of practical application, the digital zoom process of the camera will have corresponding algorithms to make up for this shortcoming. Usually, at the same time as the digital zoom, the "gaps" between these pixels are filled by technical means.

After all, the effect of filling it up through software is not as good as the real one. The change of light and shade of color, the variety of color and luster, cannot be calculated. Therefore, after the digital zoom is magnified, although the software can make the ** less blunt, it will inevitably lose details.

Optical zoom and digital zoom are two common zoom methods in digital cameras and camcorders. They all have their own pros and cons, but there is a real chance that they will be overly noticeable when using them.

Optical zoom is a change in focal length by adjusting the position of the lens through a mechanical device, so as to achieve the effect of zoom. Since the optical zoom uses a physical lens, it can maintain the clarity and color reproduction of the image, and the change process is relatively smooth, and the user experience is better.

In contrast, digital zoom is a change in focal length by zooming in or out of an image that has already been saved on the sensor. Since digital zoom is achieved by enlarging the image, it will lead to a series of quality problems such as the reduction of image pixels, the reduction of sharpness, and the increase of noise, and the change process is relatively obvious, which is easy to cause problems such as jitter or paste.

If you feel that optical zoom and digital hail zoom are overly noticeable, it is recommended to use optical zoom to get a clearer, more stable image. Although optical zoom can be more power-intensive and affect responsiveness, it is still recommended for scenes that require high shooting quality.

Optical zoom and digital zoom are two different technologies, and they each have their own advantages and disadvantages. Optical zoom is to adjust the focus distance of the lens to achieve the image to zoom in or out, it has the advantages of maintaining high image quality and achieving lossless magnification, but the zoom range is narrow, and some scenes cannot meet the needs of users. Digital zoom is basically a type of zoom effect achieved by cropping and zooming in on the image inside the camera"Simulation"Zoom method.

This allows for a wide zoom range at the expense of image quality.

If you feel that optical zoom and digital zoom are excessively noticeable when switching, it is recommended to consider the following:

1.Choose the right zoom lens: When buying a camera or phone, choose a lens with the appropriate zoom range. This allows pinning to maximize optical zoom.

2.Set up the camera carefully: When using the camera for shooting, please pay attention to adjust the camera settings, such as **, white balance, focus, etc., to ensure image quality. Try to avoid using over-enhanced digital zoom.

3.Use digital zoom wisely: Digital zoom can be used appropriately when necessary.

Note, however, that digital zoom can easily lead to a decrease in image quality. If the image resolution is high enough, you can also achieve a post-cropping effect similar to that of a loss state, but without sacrificing image quality.

Overall, optical zoom is the better option, while digital zoom can only be used as an alternative. If you need to zoom the image continuously, it is recommended to use a slider or manual focus to achieve smooth zooming.

The over-exposure of optical zoom and digital zoom is mainly due to the fact that there is a certain difference between optical zoom and digital zoom. Optical orange closure is achieved by changing the focal length of the lens, while digital zoom is achieved by changing the pixels of the image, thus forming a certain difference. Optical zoom yields sharper images, while digital zoom yields blurry images, resulting in over-visibility.

Optical zoom and digital zoom are two different technology bands. Optical zoom is achieved by adjusting the focal length of the lens, which does not reduce the image quality, and can achieve high image quality. Digital zoom, on the other hand, zooms in on the image by enlarging it, which can distort the image and reduce the image quality.

As a result, image distortion and degradation of image quality will be more noticeable if you zoom in too much when using digital zoom.

In addition, in order to pursue higher zoom ratios, some camera and mobile phone manufacturers over-design digital zoom when designing products, which is prone to obvious zoom transitions when used. This is also a problem that consumers need to pay attention to when choosing products.

Overall, in order to shoot better**, it is recommended to use optical zoom as much as possible and avoid using excessive digital zoom. When buying a product from Xiaoqi, you need to carefully compare the specifications and performance indicators of the product to choose the right equipment.

There is a big difference between optical zoom and digital zoom when it comes to zoom function, and the most significant difference is the difference in image quality. Optical zoom is achieved by changing the focal length of the lens to zoom in or out of the field of view, so there is no noticeable impact on image quality. Digital zoom is to enlarge the image pixels to achieve the zoom function, so in the process of magnification, pixel distortion and image quality degradation will occur, especially after exceeding the optical zoom factor, this effect will be more obvious.

Therefore, when making the digital zoom of the reed, pay attention to controlling the magnification so as not to affect the image quality.

Hello, optical zoom and digital zoom are two different ways to zoom. Optical zoom is achieved by adjusting the focal length of the lens, while digital zoom simulates the zoom effect by cropping the image and enlarging the pixels. Since the two methods work differently, they will also behave differently during use.

When using optical zoom, the focal length of the lens can be adjusted at will, so there is no noticeable change in image quality during zooming. When using digital zoom, the image needs to be cropped and the pixels are enlarged, so when the magnification is too high, there will be a noticeable drop in sharpness and pixel distortion, which will affect the quality of the image.

As a result, if the magnification is too high when using the digital zoom, it will be overly noticeable. When using optical zoom, there is no overly noticeable phenomenon because the image quality does not change significantly during the zoom process.

In short, both optical zoom and digital zoom have their advantages and disadvantages, and in actual use, it is necessary to choose the appropriate zoom method according to the specific situation. If you need to guarantee image quality, it is recommended to use optical zoom; If you need a wider zoom range, consider using digital zoom, but be aware that magnifying too much may affect image quality.