Is the displacement sensor exclusive to the iPhone 12 Pro Max strong?

Every year the iPhone launches will focus on the improvement of its imaging capabilities, and this year is no exception.

I took a rough count. In the 52-minute iPhone 12 full-series conference, Apple spent about 16 minutes to introduce the progress of its new products in imaging. Especially for the iPhone 12 Pro series, in the 20-minute segment, 13 minutes are describing how advanced its photography function is.

Of course, the most curious thing is not the new LiDAR sensor of the iPhone Pro series, because we have already met it on the iPad Pro before. What's more noteworthy is that under the main lens of the iPhone 12 Pro Max, the larger and "moving" sensor .

The first thing to note is that this eye-catching sensor is only used on the wide-angle camera , which is the main lens. Some friends mistakenly believe that the three lenses of the iPhone 12 Pro Max have larger sensors than the iPhone 12 Pro, but this is not the case. Pro Max’s ultra-wide-angle lens and telephoto lens are equipped with the same sensor as the Pro version.

Apple proudly declared at the press conference, "The size of the main camera of the iPhone 12 Pro Max is 47% larger than that of the iPhone 12 Pro, the low-light shooting effect is improved by 87%, and the unit pixel size is increased from 1.5 microns. To 1.7 microns".

If you have not been exposed to photography-related theories before, then these "unclear" data may be difficult to understand. Is this sensor really awesome? What is the use of sensor "displacement"? We need to start with the technical principle of this sensor.

What is a displacement sensor?

Before talking about the technical principle of the displacement sensor, we have to understand a picture and what are the main parameters. Of course, if you already have a certain understanding of photography, you can skip this part.

For consumer or professional cameras, you generally need to manually adjust the ISO (sensitivity), aperture, and shutter speed after turning to manual gear. The combination of these three parameters determines the lightness, darkness, clearness or blurry of the photo .

When shooting handheld and the light is not so sufficient, the shutter speed will directly affect the clarity of the photo . If your shutter speed is relatively low and your hands are shaking when shooting at the same time, then you may get a photo like this↓

This is because your jitter causes a different source of light entering the sensor during the shutter time, so the photo will be blurred or ghosted.

The most straightforward way to solve this problem is to increase the shutter speed, so that your "jitter speed" cannot keep up with the shutter speed. Which value is safer? In fact, there is no standard answer. This requires a comprehensive judgment based on the camera's frame, the focal length of the lens and other factors. Generally speaking, it is best not to be less than 1/60 second.

However, the higher the shutter speed, the shorter the time for light to enter the sensor. In low light environments, you have to increase the ISO (sensitivity) and increase the aperture to balance the light and shade of the photo.

▲ Other parameters remain unchanged, the higher the ISO, the brighter the photo. Picture from: photographylife

But the higher the ISO, the worse the purity of the picture, and the more obvious the noise on the picture, which is unbearable for photographers.

▲ Picture from: photographylife

So is there any way to improve these problems? How can you still shoot a clear and clear night with handheld shooting at a lower shutter speed?

Of course, in order to solve the above problems, camera manufacturers have developed anti-shake technology .

There are two main types of anti-shake technology commonly used on cameras, one is lens anti-shake , and the other is body anti-shake , which is the "displacement sensor" anti-shake in Apple's mouth.

▲ Picture from: xitek.com

The world’s first lens anti-shake system for civilian cameras was developed by Canon. It was first used on Canon EF 75-300mm F4-5.6 IS USM lens in 1993. This is the first application of optical anti-shake system in civilian cameras. .

▲ Image stabilization

The development history of body anti-shake is relatively short, and it has not yet been popularized in low-end cameras.

Body anti-shake is through the movement of the photosensitive element to offset hand shake or vibration caused by the machine, so as to achieve optical anti-shake. Cameras of high-end models such as Sony, Canon, and Olympus can already achieve "five-axis anti-shake." This is also the anti-shake principle of the new sensor of the iPhone 12 Pro Max.

With lens anti-shake or body anti-shake technology, we can easily take clear pictures in hand. Even when the shutter speed is reduced to 1/30, 1/15 or slower, pictures without ghosting can be taken.

The first application of sensor displacement technology on mobile phones

Since body anti-shake is not a new technology, what's worth paying attention to with this sensor exclusive to iPhone 12 Pro Max?

It should be noted that although this technology is quite mature, it was previously used in cameras. The internal space of the camera is much wider than that of a mobile phone. It is not an easy task to realize the optical image stabilization of the sensor in the small space of the mobile phone.

So from this perspective, iPhone 12 Pro Max is the first mobile phone with sensor displacement anti-shake.

Perhaps seeing this, some people will doubt: Isn’t the "Micro-Pan" technology of the vivo X50 series phones earlier than the iPhone 12 Pro Max?

In fact, the technical principles of the two are in two directions. In vivo, the lens group and the sensor are connected as a whole and placed in a double-ball suspension. In this way, the lens group and the sensor can move together to achieve optical anti-shake.

▲ Vivo Micro PTZ technology

The lens group and sensor of the iPhone 12 Pro Max are still separate . Unlike other models, the lens anti-shake solution for the main camera has been changed to a sensor anti-shake solution . Just like the technology used in the above-mentioned SLR, the optical image stabilization effect is achieved through sensor displacement.

Compared with lens anti-shake, Apple said that the sensor displacement anti-shake is more advanced and can bring a better anti-shake experience.

According to Apple, this sensor can accurately control the dynamics of the X-axis and Y-axis, eliminating low-frequency and high-frequency interference, such as hand shake or car vibration. Through the entire optical image stabilization system, the iPhone 12 Pro Max can obtain a stable exposure time of up to 2 seconds under low-light conditions, which is equivalent to increasing the first-level aperture exposure.

In fact, the benefits of the anti-shake upgrade can be more intuitively reflected in video shooting. With Dolby Vision and 10-bit HDR video shooting capabilities, iPhone 12 Pro Max will become one of the strongest camera phones in the short video era.

The largest sensor in iPhone history

The point of concern for this sensor is not only the displacement anti-shake technology, but also its larger size.

As already mentioned, the sensor size iPhone 12 Pro Max main camera, iPhone 12 Pro greater than 47%, almost half of the increase, so far the largest Apple image sensor.

In the photography circle, we often hear a saying that is "the bottom-level one crushes people to death." This means that the larger the sensor size, the larger the photosensitive area, the more light it can capture, the better the photosensitive performance, and the higher the signal-to-noise ratio. Simply put, the better the imaging effect.

In the impression of many friends, the higher the pixels, the better the picture quality. In fact, this is a one-sided perception. In fact, increasing the size of the sensor is more important for improving the image quality than increasing the pixel. The effect of a 1/1.8-inch 8-megapixel camera is generally better than that of a 1/2.7-inch 12-megapixel camera (the photosensitive area of ​​the latter is only 55% of the former).

▲ Mobile phone cameras of various sizes. Picture from: alibaba

At present, we do not know the specific size of the iPhone 12 Pro Max main camera sensor. For reference, the size of the iPhone 11 Pro main camera sensor is 1/2.55 inches.

A larger sensor means more light. This is as large as the room area, but the windows are larger, so the light in the room will be better.

Apple said that this enlarged sensor has enabled the iPhone 12 Pro Max to " improve 87% in low-light shooting ." This data proves that the new sensor's shooting performance in low-light environments will be stronger than the iPhone 12 Pro, and the improvement is more obvious.

▲ Apple official sample

Even if the sensor size is increased, 12 million pixels are still selected for the main camera of the iPhone 12 Pro Max. The benefit of this is that the unit pixel size of the photo has increased from 1.5 microns to 1.7 microns.

It's like the room is enlarged, the same number of balloons can be blown bigger. The larger the unit pixel, the more information will be carried, so that the latitude and purity (noise control) of the photo will be better.

▲Apple official sample

The reason why Apple insists on 12 million pixels is actually to balance photography and video. For example, Sony's full-frame mirrorless A7S series, in order to highlight its video shooting capabilities, always adhere to 12 million pixels.

This is because for 4K video recording, a 12-megapixel sensor is the optimal solution. After this pixel is cropped to 16:9, it happens to be rounded up to the 4K resolution, making the most of the effective CMOS pixels to optimize the video quality without putting too much burden on the processor.

To be honest, this time the iPhone 12 Pro Max shines the most on this displacement sensor. And I have reason to believe that sensor displacement technology will soon be popular on next year's flagship machines. Because this technology can not only bring better anti-shake effect, but also reduce the difficulty of lens module design, and achieve stronger optical quality within the same thickness.

At present, iPhone 12 Pro Max may be one of the best choices for professional photographers and videographers. Unfortunately, it continues the weight of the previous generation, 226 grams makes it difficult for patients with tenosynovitis, and may make photographers who like small-screen mobile phones tangled.

In addition, with regard to the displacement sensor of the iPhone 12 Pro Max, what is the actual photographic ability? After Ai Faner receives the real machine, we will provide you with a more detailed evaluation, so stay tuned.

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Ai Faner | Original link · View comments · Sina Weibo