What is the difference between optical zoom and electronic zoom?

Optical zoom is known as optical zoom in English, and digital cameras rely on an optical lens structure to achieve zoom. It is to zoom in and out of the scene to be photographed by moving the lens, and the larger the optical zoom factor, the farther away the scene can be photographed.

Electronic zoom is also known as digital zoom, the English name is digital zoom, digital zoom is through the processor in the digital camera, the area of each pixel in the ** is increased, so as to achieve the purpose of magnification. With digital zoom, the captured scene is magnified, but its clarity will be reduced to a certain extent, so digital zoom does not have much practical significance.

Optical zoom. It relies on the optical lens structure to achieve zoom, which uses the lens movement of the camera to zoom in and out of the scene to be photographed. There is basically no loss of image quality due to optical zoom.

Electronic zoom: It works in a way similar to how we enlarge a certain part of the image in the computer, it is a kind of electronic processing of the picture by using the electronic circuit of the camera to achieve the effect of optical zoom, but this electronic zoom is to achieve the purpose of zoom by losing image quality, the larger the electronic zoom, the worse the image quality, so, this electronic zoom (digital zoom) has no practical value. To choose a camera, you still need to choose by optical zoom.

4-8 times is enough for general household use.

To put it simply, optical zoom is the real zoom of the camera, which is to zoom in on the distant object without affecting the image quality; Digital zoom is like using picture viewing software on the computer to magnify**, the larger it is, the less clear it will be, and it is also the internal expansion, which has an impact on the image quality! In short, if you know the camera, we can almost ignore the digital zoom (electronic zoom) and just look at the optical zoom!

Optical zoom is a change in focal length that is really achieved through the change of the environment group, which is a zoom in the real sense. Electronic zoom, on the other hand, takes a screenshot of the image circle and zooms it in, and the lost details are calculated using an interpolation algorithm, which is pseudo-zoom, which will lose the details of the image.

Optical zoom Closes in distant targets by moving the lens Affects image quality Within a tolerable range Electronic zoom Simple magnification of the image Too much noise Cannot be used.

Mobile phone digital zoom and optical zoom.

1. The difference between digital zoom and optical zoom is that optical zoom achieves 10 times closer to the shooting target through the movement of the focal length of the lens, which can clearly magnify the image without any loss of image quality. The digital zoom function magnifies the image by 120x. But the picture quality has an impact.

2. When the digital camera with optical zoom zooms at a distance, the sense of space and hierarchy of people or things is better than that of digital zoom, but the use of digital zoom products is more convenient.

The difference between digital zoom and optical zoom is the difference in image quality. Digital zoom is to increase the area of each pixel in the digital camera through the processor in the digital camera, so as to achieve the purpose of magnification. The optical zoom is a stuffy makeup that relies on the optical lens structure to achieve zoom, that is, the camera lens movement to enlarge and shrink the scene to be photographed, the larger the optical zoom multiple, the farther the scene can be photographed.

Digital zoom is a change in the vertical direction of the sensor to give people a zoom effect. The smaller the area on the sensor, the more visually the user can see only the part of the scene. However, since the focal length does not change, the image quality is relatively poor compared to normal.

Through digital zoom, the captured scene is magnified, but its clarity will be reduced to a certain extent, so digital zoom and can't make much practical sense.

Optical zoom is created by a change in the position of the lens, object, and focal point. When the imaging surface moves in the horizontal direction, the angle of view and focal length of the slag judgment will change, and the farther scenery will become clearer, making people feel like an object is progressing. Another important point of learning zoom lenses is the zoom ability, which includes both optical zoom and digital zoom.

Although both can help magnify distant objects during telephoto shooting, only optical zoom can support the addition of more pixels after the image of the subject, so that the subject is not only larger, but also relatively clearer. In general, the higher the zoom factor, the more suitable it is for telephoto shooting. Optical zoom, like conventional camera design, depends on the focal length of the lens, so the resolution and image quality do not change.

Hello dear ! 1.Electronic zoom, also known as digital zoom, is actually the continuous expansion of the image Because the focal length has not changed, the size of the image put on the CCD has not changed, so the clarity of the object you shoot becomes blurry with the expansion That is to say, digital zoom has no practical significance, Zen Huaigao is simply like having a ** on the computer from it You take a screenshot through the computer and then enlarge the screenshot And you** The actual pixels are still so many No change So the more you expand the screenshot, the less clear it will be2

Optical zoom is actually through the lens in the lens to make the focal length longer Just like a telescope Imaging through optical principles So in the end, how long the focal length of the lens can see how fresh it can always be photographed very clearly, simply put, it is like having a ruler on the computer** You take a magnifying glass to look at it No matter how you look at it, it is still the original picture And the reason for magnification is that your magnifying glass is clear how you see it The bigger your magnifying glass is, the bigger it will be3So optical zoom is better than digital zoom When you buy a video camera, you mainly look at optical zoom rather than digital zoom Don't be confused by the advertisement of buying a video camera, say how many times the digital zoom Digital zoom is actually Mingsheng to enlarge the image Be sure to buy a large optical zoom The larger the optical zoom, the bigger and farther you can shoot. Hope it helps!

Category: Electronic Digital.

Problem description: Also, is the camera's anti-shake function to prevent the lead from shaking my hands when taking pictures, or to prevent people from moving?

Analysis: Optical zoom --- English name is optical zoom, digital video cameras rely on optical lens structure to achieve zoom. The optical zoom method of digital camcorder is similar to that of traditional 35mm cameras, 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.

Digital zoom --- English name is digital zoom, digital zoom is through the processor in the digital camera, the area of each pixel in the ** is increased, so as to achieve the purpose of magnification. This technique is similar to using image processing software to increase the area of **, but the procedure is carried out in a digital camera, and some pixels on the original CCD image sensor are used"Interpolation"The processing method is to magnify, and the pixels on the CCD image sensor are enlarged to the entire screen with an interpolation algorithm.

Anti-shake function--- In order to prevent hand shaking when taking photos, people who are new to digital staring cameras often have this confusion, that is, the captured picture is not clear enough, and ghosting or blurring will always occur. In addition to occasional out-of-focus (i.e., the camera fails to focus properly), the shutter speed is largely due to low shutter speeds. In general, in handheld conditions, the shutter speed for sharp** shots should be at the reciprocal or even higher focus.

For example, the Canon A75 lens has an equivalent focal length of 35mm 105mm, so at the wide-angle end, the shutter speed should be maintained for at least 1 40 seconds to ensure that the shooting is clearer, while at the telephoto end, the shutter speed should reach 1 125 seconds. And if the lighting conditions on the scene cannot meet this requirement, then it is not so simple to shoot a clear **.

As you can imagine, image stabilization is even more necessary for those products with 10x optical zoom, because the telephoto end of these products often reaches more than 370mm, so the shutter speed must be above 1 400 seconds to be qualified.