What is the digital zoom and optical zoom of a digital camera? Is the greater the multiple, the bett

The difference is: optical zoom adjusts the image distance by adjusting the distance between the convex mirror and the imaging element, the larger the image distance, the larger the object distance of the double, and the farther you can see, the smaller the range;

Digital zoom is only enlarged electronically, of course, the larger it is, the worse the quality, just like magnifying on a computer**;

It is not that the larger the zoom factor, the better, depending on the use needs, the larger the easier it is to shake, the more blurry the image, unless it is equipped with a professional machine, the framing distance of general life photos is 2 5m, and the zoom factor does not need to be too large.

Optical zoom is like using a telescope to zoom in on the distant picture, and digital zoom just zooms in on the picture, and the picture will become blurry, so of course the optical zoom is bigger, but the price will be more expensive, but the home is three or four times enough!! I don't usually use digital zoom!!

Optical zoom does not affect the quality, and digital zoom seriously affects the quality, so the larger the optical zoom, the better.

Optical zoom: zoom is achieved by moving the optical lens;

Digital zoom: The image captured by the image sensor behind the magnifying lens is like reading a newspaper with a magnifying glass, the larger it is, the blurrier it becomes;

Magnification: Enough, optical zoom is equivalent to 35mm camera, first 35-105, then 35-200; Several quasi-professional prime fixes are also very good;

Magnification: whether the bigger the better, depends on what kind of subject matter is shot, the pocket fool machine is recommended to be enough daily, the large optical zoom magnification means that the cost is high and the technical requirements are high, portability is also worth considering, amateur SLR machine chicken ribs;

Optical zoom relies on the structure of the optical lens to achieve zoom, and the lens movement of the camera is used to zoom in and out of the scene to be photographed, so the larger the optical zoom factor, the farther the scene can be photographed. It should be said that the bigger the better

Digital zoom is actually "interpolated" to enlarge some of the pixels on the original CCD sensor. Digital zoom magnifies the subject, but its sharpness decreases

Check it out and **.

It should be said that the larger the optical zoom factor, the better, but the digital zoom is better not to use for the higher requirements, because although the scene is magnified, the image quality will decline The key is to look at the optical zoom factor Now the optical zoom of the digital all-in-one machine on the market has reached 15 or 18, which is more practical.

Introduction: Friends who are ready to buy digital cameras can often see or listen to salespeople on the promotional page that a certain camera is several times zoom. For those who don't understand the terminology of cameras, they may not understand what exactly this means. This article will answer this question for you.

How to read the camera zoom factor

Take the Canon Ixus 300 HS pictured here as an example, with the words "Canon Zoom Lens IS" printed on the front of the camera around the lens. "Canon" is Canon's brand name, "Zoom Lens" indicates that the camera uses a zoom lens, the "IS" at the end indicates that the camera has image stabilization, and the number "is the zoom factor of the camera lens, i.e., times."

What is zoom factor

We know that this camera uses a zoom lens. Since it's a zoom lens, it's'There will be 2 readings at the focal length. The smaller number is called the wide-angle end, and the larger number is called the telephoto end, and you can use any of the two focal lengths when shooting.

Divide the telephoto number by the wide-angle number to get the zoom factor.

In this example, the focal length range of the lens is , hence the zoom factor =.

The significance of the zoom factor

The zoom factor of a camera explains the shooting adaptability of this camera to a certain extent. We know that the wider the wide-angle end of the focal length of the lens (the smaller the number), the wider the scene can be shot; The longer the telephoto end (the larger the number), the farther away the scene can be shot. Since the wide-angle end of today's digital cameras differs very little, the larger the zoom factor, the farther the scene can be captured.

At present, there are some large zoom cameras, whose zoom factor can be more than 20x, not only to shoot large scenes in front of you, but also to shoot objects far away. A large zoom camera is useful for situations that require shooting from a distance, such as sports competitions and concerts, but it is difficult for ordinary digital cameras to shoot that far.

Problems with large zoom cameras

Since the zoom factor determines adaptability, is bigger the better? The answer, of course, is no. This is mainly because of the technical limitations of zoom lenses.

For zoom lenses, the higher the zoom factor, the more complex the lens structure and the need for more lenses. Whether it's design or production, the more difficult it becomes. In addition, due to the increase in lenses, it often has a huge impact on image quality.

A large zoom factor is basically sacrificing image quality in exchange for the convenience of shooting.

How to choose

In general, the zoom factor of digital cameras is mostly in the range of 3-5x. Whether it's daily recording or traveling, this focal length range can basically meet the needs of the average user. For such users, it is not recommended to buy a large zoom camera.

If you often need to shoot from a distance, but also take care of everyday close-up shots, then consider choosing a large zoom camera. At present, the zoom factor of large zoom cameras ranges from 10 to 20, and the principle of the smaller the zoom factor is still the better.

Imaging with a zoom lens can vary in various focal areas. The wide-angle end expands the shooting range, and the telephoto end magnifies the subject, allowing the photographer to freely change the shooting range even if the photographer does not move. This change is referred to as "zoom magnification" in photographic terminology and is also indicated in the camera's product manual.

The higher the zoom magnification, the greater the range of the focal area at the wide-angle and telephoto ends, and the more versatile they can be. However, cameras with large zoom magnifications tend to be slightly larger due to their structure, and cameras that value portability usually use a zoom magnification of about 3 or 4x.

Optical zoom for digital cameras (optical

zoom), the higher the focal length of the digital camera's lens.

To a certain extent, the higher the better, because such a camera can have a wide angle, capture a wide landscape with a visual impact, and can zoom in on distant objects without a very large loss of detail.

The digital zoom of the digital camera is another working principle, the digital zoom is at the cost of losing the details and pixels of the photo, which is equivalent to opening a ** on the computer, and then enlarging it, which is visually equivalent to zooming in.

So a digital zoom was carried out, that is, the pixels were approximately reduced.

However, in the case of optical zoom, of course, the larger the magnification, the wider the extensibility of the lens, which can be used for shooting in various situations.

However, the increase of the optical zoom magnification of the lens also means that the internal structure of the lens is more complex, and the simpler the internal structure of the lens is from the perspective of traditional optical imaging principles.

fewer lens groups).

The closer the image of the lens is to reality, that is, the distortion is small, the color reproduction is good, the chromatic dispersion is small, and so on.

This is also why in DSLR cameras, there are still so many prime lenses (no zoom magnification, no zoom, can only shoot at a fixed focal length, if you want to change the focal length, change the lens) exists.

Therefore, from the perspective of imaging, the larger the zoom magnification, there will still be more loss in imaging, of course, these losses are very subtle, for the average person, can be ignored.

Of course, for enthusiast SLR players, minimizing the loss of these details is an important reason for them to pursue tens of thousands or even hundreds of thousands of expensive shots.

Hehe, whether it is good or not depends on your own needs. The wide angle is suitable for shooting landscapes, and the large telephoto is generally used for photography such as bird hunting and sports. If we only talk about image quality, then optical zoom in zoom has little impact on image quality, while digital zoom has a big impact on image quality.

Optical zoom is to use the lens to bring the object image closer by using optical characteristics; Digital zoom is similar to "lattice" and will feel a coarse image quality. When choosing a camera, first determine your needs, if you really need a telephoto, you should only look at the optical zoom value, but also pay attention to the aperture value of the maximum telephoto (the larger the value, the better, generally 10 35 times the telephoto end is the main), which has a great impact on low-light shooting. The Canon SX series or the Nikon P series are recommended.

Such as Canon's SX130IS

The bigger the digital zoom, the worse it is, so the landlord still buys a similar focal length camera to play around. If you want to buy a DSLR, you can buy a sleeve to practice. For zoom lenses, the higher the zoom factor, the more complex the structure of the lens, the more lenses are needed, and the more difficult it is to sleep in both design and production.

At the same time, larger corners mean worse image quality.

Zoom factor concept

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. However, Sony has created the original "Smart Digital Zoom", an advanced technology that is said to allow images to maintain a certain level of clarity even after digital zoom.

The total zoom count of a digital camera is calculated as follows: for example, Sony's F717 optical zoom is 5x, while digital zoom is 2x, so the maximum zoom is 10x. The digital zoom in a digital camera can generally be turned off.

In addition, there is also a new and unique Sony Smart Zoom function, which can zoom in and zoom without zooming in on particles, so that the magnified image can maintain the original detailed quality. Smart zoom provides different degrees of enhanced zoom function according to the choice of different image sizes. Unlike digital zoom, smart zoom keeps the image quality the same as the original image.

At present, the digital zoom of digital cameras is generally about 6 times, the digital zoom of video cameras is about 44 times -600 times, and 40 times is enough in actual use. Because too large a digital zoom can cause serious damage to the image, sometimes even because the magnification is too high to distinguish the captured image. If the zoom factor is not enough, you can add a magnifier in front of the lens, and the calculation method is like this, a 2x teleconverter is set on a digital camera that originally had a 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 multiplication of the multiplier and the optical zoom factor are obtained.

If you want to buy a DSLR camera, you should start with the standard head of the set, and playing SLR is a gradual search, if you do it in one step, it will sometimes affect your shooting ability. There are a lot of things that you don't use and will affect you.

Welcome to the Camera Forum to communicate.

Hope you find the above helpful!

It depends on how to use it, and the most important thing is to buy the right one.

Theoretically, the higher the optical zoom factor, the better, and the higher the digital zoom factor, the better!

Optical zoom refers to the push-pull of the focal length of a digital camera from a wide angle to a telephoto or vice versa by the refraction of the optical lens group. Optical zoom can support the image of the subject after the image, add more pixels, so that the subject is not only larger, but also clearer, so as to widen the distance between the subject and the background, to achieve the purpose of highlighting the central subject. In general, the larger the zoom magnification, the more suitable it is for telephoto shooting, such as shooting birds and beasts, celestial bodies and people or things with wonderful subjects that are afraid of being alarmed.

Optical zoom is the same as a conventional camera design and depends on the focal length of the lens, so the resolution and image quality do not change.

Digital zoom is to reduce the original image size, so that the image on the LCD screen becomes larger, but does not make the image details clearer, on the contrary, too large digital zoom will also make the image rough, agitation increases.

Therefore, when buying a digital camera, we recommend that you consider the optical zoom factor rather than the digital zoom when buying. At present, mid-range cameras are generally about 3x optical zoom, and they are relatively mature in terms of technology and technology. However, there are also models that have an ultra-long zoom function, such as 10x to 12x optical zoom.

Larger optical zoom ratios are more expensive and may be purchased according to individual needs.

Digital zoom is made using a built-in program, unlike optical zoom, which is achieved by moving the lens, and the image quality is worse than optical zoom. It will inevitably lose the quality of the image, and we do not recommend using the digital zoom function in normal shooting conditions.

Generally speaking, the larger the optical zoom, the better, yes.

And the greater the digital zoom, the worse the image clarity.

There isn't much practicality.

Of course, optical zoom is high, but the actual operation has to have a certain degree of difficulty, there is no basic skill that requires a tripod, digital zoom is not very useful, it can not be considered, the practical value is not large, and post-production can be done at will.