Is it better to have a higher optical zoom and a digital zoom factor?

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.

If the optical zoom is large, it is more convenient for daily use, and it is more convenient to shoot far and near, but if it is too large (such as more than 10 times), you need a relatively high shutter speed when actually taking pictures, otherwise it is easy to be virtual, and it is slightly better if you have an anti-shake function.

Digital zoom is useless, it is obtained by sacrificing clarity, don't pay attention to the digital zoom number when you buy it, just look at the optical one.

Nothing can be absolute, just apply.

In order to ensure the quality of imaging, many people do not like to use optical zoom lenses; Digital zoom is even more pointless, and experienced people never use it!

Optical zoom uses lens movement to zoom in and out of the scene to be photographed. The greater the optical zoom factor, the farther away the object can be captured.

Digital zoom is actually an electronic enlargement of the image, in which the pixels on the CCD image sensor are enlarged to the entire screen using an interpolation algorithm. 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.

To put it simply, optical zoom is a real sense of zoom, ** when it comes out, it is a real zoom effect, and digital zoom is not able to change the pixels of the photo, but only visually zoom in and out.

To put it simply, optical zoom is to change the distance of the photographed object, and digital zoom is to enlarge the photographed object!

If the optical zoom of a digital camera is 28mm at the wide-angle end, the optical zoom is 18x, then the telephoto end is 28x18=504mm, and if the DSLR lens is 18-105, then 105 divided by 18 is nearly 6 times, so is it clear?

At the time of the birth of digital cameras, in order to distinguish them from the focal length of the traditional 135 lens, the focal length of the lens was pitifully small, so the method of only talking about the zoom factor and not the actual focal length was adopted, which would make people forget about the small focal length and small photosensitive area, which was actually a kind of diversion method. However, the SLR uses the lens of a 135 camera, which is usually based on the actual focal length, such as 17-85mm, which means that the zoom range of this lens is 17mm 85mm. If you insist on asking how many times the lens is, then this lens is a 5x zoom.

The reason for this conversion is that since the SLR can change the lens, if you change the 70-200 lens, then the zoom factor is less than 3 times, but the base is from 70mm, in fact, you have to see farther than the previous 5x zoom lens. Even for consumer cameras, the end result of optical zoom factor is related to the starting cardinality, not all fields of view of the same magnification are the same, so the magnification of consumer cameras is also a vague concept.

In the lens design, there is such a law, that is, the larger the zoom, the worse the lens, because the larger the zoom, the more complex the lens structure and affect the imaging.

This problem is not very serious in telephoto cameras, and SLR lenses also have large zooms, such as 18-200, and Canon also has 35-350, which is a white cannon. If you want a large aperture, you can't definitely have a zoom lens, a prime lens, which has a relatively simple structure and excellent imaging. For example, 50 can reach or aperture, which is very important.

As for whether the 20x zoom is 20x magnification, it is not clear. The number given by dividing the maximum focal length of the lens by the minimum focal length is the zoom factor.

Long-point lenses, such as Nikon's small bamboo cannon 70-200, this is more than 10,000, and bamboo section by section, so it is called a small bamboo cannon, the sense of compression of this lens (such as the backlit portrait under the sunset) is relatively strong, and the wide-angle lens has a strong sense of perspective, the feeling of near and far is strong, so even if you use the wide-angle lens to shoot closely, the object on the ** is as big as the telephoto lens, and the feeling is different.

The maximum focal length divided by the smallest focal length is his multiple, such as 18-55, his lens is about 3x zoom. But we can't calculate how far he can actually see in multiples, such as 18-55 is 3 times, 700-200 is less than 3 times, we have to look at the last value, the larger the later the value, the farther we can see. Then the 70-200 lens can obviously see farther away, because its telephoto end is 200mm

Ordinary large zoom digital cameras usually have a wide angle of 28mm, and if he is 20x, then his telephoto end can reach 28mm*20, which is 560mm(It seems that there are not many machines with 20 times, but there are more machines with 15-18 times).

As for the image quality, it is determined by the size of the CCD, and the zoom is also related to the size of the CCD. Theoretically speaking, the smaller the CCD CMOS, the easier it is to make a large zoom lens, and the more difficult it is to do vice versa, so we see that large zooms of SLRs are super expensive. Of course, it is also related to the quality of the lens, the amount of light entering (that is, the aperture) rough change control (photo distortion), etc., all determine the difference between camera imaging, and the larger the zoom factor, the more difficult it is to control the phase, usually the large zoom lens can not be in every focal length is very good, may be the best in a certain focal length, in other focal lengths are not as good as this focal length. 。

The zoom factor of the lens of a DSLR camera is generally smaller than that of a consumer camera, because the larger the zoom factor, the greater the number of lenses, the greater the impact on image quality.

But a DSLR can select multiple lenses. For example, 17-50 is a triple zoom, and 50-150 is a triple zoom. But if you have both lenses, use 17-50 for wide angles and 50-150 for telephotos.

That combination can achieve a 9x zoom effect.

The higher the optical zoom factor of a digital camera, the better the lens focal length extension of the digital camera. To a certain extent, the higher the better, because such a camera can have a wide angle of bends, 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 we did digital zoom, which is about shrinking the pixels.

However, for optical zoom, of course, the greater the magnification, the wider the extensibility of the lens, and it 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 complicated, from the traditional optical imaging principle, the simpler the internal structure of the lens (fewer lens groups), the closer the imaging of the lens is, that is, the distortion is small, the color reproduction is good, the dispersion is small, and so on. That's why in DSLRs, 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).

So from the perspective of imaging, the larger the zoom magnification, the more imaging will still be lost, 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 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 the image quality is only discussed, then the optical zoom in the zoom has little impact on the image quality, while the digital zoom has a greater impact on the 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 the Canon SX130 IS

That's certainly not bigger for better. I'm a professional portrait photographer. Most of your home digital cameras are used to take portraits.

Then the focal length for portraits is 24-105. For example, Canon's card machine, Ixus Daxingmin 310HS, is this focal length. Belt state.