The balance will be carried out in the evaluation of Canon 5D4, a world-class boutique.

IT 168？ Evaluation I personally like Mr. Zhang Wei, who is a veteran player.

It does bring us too much joy, so it is also regarded as a masterpiece in the world. In the camera circle, the product with the highest topic and the strongest momentum recently is by no means 5D4, it is a boutique in my mind. Generally speaking, Canon has removed the nickname of toothpaste factory from the previous 5DS/R, and continuously released many high-level SLR, and the latest 5D4 is no exception. Canon 5D4 can be regarded as a product that carries out the concept of balance to the end. I still remember the slogan put forward by Canon when it released 5D3: Only legends surpass legends. Judging from our overall performance evaluation of 5D4, this sentence basically expresses a positioning of 5D4 in my mind, and I won't say much nonsense. Let's take a look at the detailed evaluation of 5D4.

Atlas will be balanced and will last until the end. Appreciation of Canon 5D4 real shot proofs.

"advantage

: 1. pixels enter the level of 30 million pixels.

2. Second-generation 6 1 point focusing system (all 6 1 points support F8, so it is easy to add 2x enlarger lens).

3. New metering system (65438+500,000 pixel RGB+ infrared metering sensor)

4. Add full-pixel dual-core CMOS AF technology (realize 4.3fps servo continuous shooting in real scene).

5. Add touch screen and WIFI transmission function.

6. Dual-core RAW optimization provides three adjustment functions.

Step 7 increase

DCI？

4K video (4096×2 160) can capture 8.8 million pixels in a single frame. 8. Add HDR, multiple exposure and delayed photo/video functions.

"shortcomings

: 1. The current price is somewhat inflated.

2. The power failure is very fast in the real-time view (the battery capacity should be increased).

3.4K video is not over-sampled, and the lens factor is about 1.74 times. 4. Do not add c-log mode.

"Assessment summary:

After the evaluation, the product should always be summarized. I still remember a few years ago, everyone was unanimously spraying Canon, saying that Canon was a toothpaste factory. The ancestral sensor has been used for too long, so it is normal to cause some doubts. But judging from the performance in recent years, it's quite a bit of a feeling of eating and drinking. Bit by bit, through constantly updating products, gradually regain the market and praise. This time, 5D4 is the product of this trend. 5D4 really doesn't dominate with a function that others can't achieve like D800 (of course, it has been surpassed by 5DS now), but the design concept of Series 5 has always been balance, balance and balance, so what we see on D5D4 is balance. Every part has been upgraded, and the new functions after the upgrade are quite real, almost adding some new functions of Canon now, without any concealment. Moreover, the addition of full-pixel dual-core CMOS AF has injected powerful hardware configuration into 5D4. You can't imagine that Canon's SLR real-life focusing or shooting has been so smooth now, and the advantages of micro-single in this respect are gradually decreasing. Therefore, Canon 5D4 is indeed balanced in all aspects and has no obvious shortcomings, but this does not mean mediocrity, because various functions can still be maintained at a high level. "Procurement guide:

The most terrible thing about a product is that it has no obvious shortcomings and is suitable for any subject. Because this basically meets the needs of most people, when others don't know what to buy, recommending this will never make people regret it. So, do you think it is worth buying? Must be worth buying? But do you buy it now? I have a negative attitude towards this point. On the day of the press conference, the official price of a single machine was 26,599 yuan, which is definitely a bit high. And today, the dealer's price has given 24,999 yuan, which has dropped by almost 2,000 yuan in such a short time. So, wait another six months, and there will definitely be a better price. Canon's production capacity is no problem, and it is not limited by other sensors (Sony), as long as the yen exchange rate does not skyrocket historically.

"Canon EOS 5D4 appearance introduction.

Canon 5D4 has a good overall feel and is lighter than the previous generation. Of course, this is very rare. In addition, there are 4K, live view, WIFI transmission and other large heat producers, so the heat of the fuselage will definitely increase when it is used, but as far as we know, Canon paid special attention to the problem of heat dissipation in the design process and used new materials, so the heat dissipation situation is still very good.

"The number of pixels has exceeded 30 million, and the image quality has improved significantly.

We know that Canon 5D Mark IV adopts a brand-new 30.4 megapixel sensor, and the number of pixels has exceeded 30 million, which is about 8 million pixels higher than that of 5D Mark III. Next, I will distinguish between 5D Mark IV and 5D Mark III with 24-70mm F4 lens for real-time contrast test of resolution to see how much image quality can be improved by higher pixels:

▲ Resolution contrast test

Through the comparison of real shots, it can be seen that the picture details of Canon 5D Mark IV are better, especially the edge resolution is more obvious than that of 5D Mark III. High pixels can get relatively better image quality in post-cropping and output, so Canon 5D Mark IV is more suitable for professional photographers who pursue the ultimate.

"The new noise reduction algorithm has obvious effect. ISO6400 is available.

In addition to the DIGIC 6+ processor, Canon 5D Mark IV also updated the noise reduction algorithm, which theoretically has better noise reduction performance. Let's feel the high sensitivity performance of Canon 5D Mark IV in the actual test. The original sensitivity of Canon 5D4 is ISO 100-32000, which can be extended to ISO 50- 102400.

▲ Sensitivity comparison test

Through the above comparison, we can see that Canon 5D Mark IV has more details at the same sensitivity. The new algorithm effectively reduces the amount of red and green noise, making the picture look purer, and there is no obvious noise even if ISO 12800 is used. The noise control level of Canon 5D Mark IV is basically the same as that of 5D Mark III after the number of pixels has increased by nearly 8 million, and it is not easy to have higher definition. In daily use, it is no problem to control ISO below 6400.

"The improvement of tolerance has obviously adjusted the details after exposure.

In the past, tolerance was not the advantage of Canon cameras, but this situation has been greatly improved on 1DX Mark II and 80D. I believe that how much the latitude of Canon 5D Mark IV has improved compared with the previous generation is also a point of concern, so we conducted a comparative test. It should be noted that at present, PS does not support 5D4 RAW files, and the exposure adjustment of Canon DPP software is only three files, so we only measured the positive and negative three files this time.

▲ Tolerance comparison test

Happily, you can intuitively feel the improvement of tolerance of Canon 5D Mark IV. Except for the obvious loss of details in the forced pullback of the third exposure, the details of the rest of the picture are rich enough. Although there is still room for improvement compared with those models with very touching tolerance, we have clearly felt that Canon is making progress. Of course, tolerance is not the only factor that affects imaging. Canon 5D Mark IV has such tolerance performance, which can be said to be excellent enough.

1. Two-pixel RAW optimization function

The dual-pixel RAW function is definitely the most prominent function on Canon EOS 5D4, which is mainly due to the addition of full-pixel dual-core CMOS AF technology to Canon EOS 5D4.

Canon's all-pixel dual-core CMOS autofocus technology stems from a new sensor design. * * * has two photodiodes under each pixel. When focusing, the two photodiodes A and B under a single pixel focus quickly with a phase difference, and then the image signals of the two photodiodes can be output as a pixel when imaging.

Therefore, Canon's technology can shoot two parallax images at the same time, and this dual-core RAW optimization function is based on this principle. Therefore, when full-pixel dual-core RAW shooting is enabled, dual-core data and subject depth information will be recorded (just like people record information with their left and right eyes). Based on this information, we can use the full-pixel dual-core RAW optimization function to process images in multiple dimensions, and improve the image quality when using Digital Photo Professional for RAW imaging later.

First of all, this function is not automatically turned on by default. There is a separate opening option in the fuselage menu, but don't forget to set the image quality to shooting RAW format before opening full-pixel dual-core RAW.

It is worth noting that when the full-pixel dual-core RAW format is turned on, the file size of dual-core RAW will be twice that of ordinary RAW format, and it will also slow down the continuous shooting speed.

It should be noted that in dual-core RAW mode, ① continuous shooting, ②HDR, multiple exposure, B-door cannot be used in live view mode, and ③ digital lens optimization cannot be used.

After opening, you can also see an additional DPR icon in the menu interface, which indicates that you are currently in the full-pixel dual-core optimization mode.

Turn on full-pixel dual-core RAW. After optimization, it is the test of real shooting. Here, we mainly test the resolution compensation and fuzzy offset functions:

(1) Resolution compensation:

Resolution compensation is not simply sharpening the whole picture, but sharpening and shifting focus according to the phase difference information of the object recorded by full-pixel dual-core RAW.

This function is actually very simple to use. We open the full-pixel dual-core RAW tool in DPP software, click the image fine-tuning button to adjust the focal plane position, and then click Save.

With this function, we can recycle some "waste films" that cannot be used due to focus shift.

② Fuzzy migration:

When we shoot with a large aperture lens, the subject may be blocked by the blurred foreground, and usually such photos will be deleted as "waste films". Through the fuzzy offset function, we can move the blurred foreground to reduce the occlusion of the subject.

Similarly, we can adjust the offset direction of fuzzy objects in the menu.

Generally speaking, the adjustment effect is quite obvious. Although these functions can save our "waste films" to some extent. However, the adjustment range of these functions is still relatively limited, and there is no guarantee that every photo can be successfully "saved". Therefore, it is very important to try to avoid mistakes in the early stage of shooting. However, I still hope that camera manufacturers can develop more such functions, reduce the shooting difficulty of photographers as much as possible and improve the success rate of photos. So that more people like photography and discover and record the beautiful moments around them.

"2. Digital lens optimization

：

In the menu of 5D4, you can see that the function of digital lens optimization has been added. Originally, this function can only be realized in DPP (Digital Photo Professional Edition) software. Now this function is fully realized in 5D4.

Before 5D3, peripheral brightness correction and color difference correction were added. This time, the distortion correction of wide-angle lens and diffraction correction of small aperture shooting are added.

But at the same time, it should be noted that after turning on digital lens optimization, the speed of continuous shooting will slow down. My personal guess is that it will process more data, which will affect the speed of continuous shooting, and it should be improved in the future.

When digital lens optimization is turned on, the first two options will be automatically hidden, because those two functions are already included in digital lens optimization. One more thing, Canon's optical optimization (peripheral brightness correction, chromatic aberration, distortion and diffraction) is based on some official lens data, but all lenses released by Canon in the future will have built-in chips to record lens data, so there is no need to update them in the future, and the optical optimization data of any new lens can be used directly. Digital lens optimization needs to be registered through EOS utility.

"3. Add white priority white balance mode.

"White priority" is a new white balance mode, which eliminates the influence of incandescent lamps and other light sources and tries to restore white as much as possible, thus obtaining a clean imaging effect. The previous automatic white balance has a new name, called "atmosphere priority".

In the white balance option of the menu, click Enter, and then dim the INFO button to switch between "Atmosphere Priority" and "White Priority", while other white balance modes remain unchanged.

▲ Atmospheric priority mode

▲ White priority mode After two different white balance modes are turned on, the contrast in the same scene is very obvious. The overall shooting environment should be yellow, and in the limited white mode, you can see that the color tone is much colder. So I personally guess that after turning on this mode, it will automatically make the white balance of the picture cooler. However, it is more useful for some environments with more yellow light sources.

"4. There are not only 4K videos, but also 4K screenshots.

Canon's department has always attached great importance to the video shooting function since 5D2. This time, 5D4 continued this traditional advantage, that is, it added the 4K video function and adopted the Motion JPEG compression format (the data volume is relatively large, which can be considered as a point that can be improved in the future). However, unlike Canon EOS- 1DX Mark II, the 4K video of EOS 5D4 only supports 30P(NTSC) at most.

However, we also know that the 4K video of Canon 5D4 takes the pixel area with the center of 4096×2 160, and it is read in full pixels in a point-to-point way, that is, it is not collected in full pixels and then compressed (oversampling), so the disadvantage is that when shooting 4K video, the shooting angle will be narrowed because the central part of the picture is intercepted. Finally, we have to calculate the lens factor of about 1.74 times. However, in the format of 1080P, the over-sampling mode of full pixel acquisition and compression is adopted.

At the same time, if you choose high frame rate short film shooting in video mode, you can shoot 1280 x 720 120P video, which is convenient for later upgrade.

In order to facilitate more professional teams to use Canon 5D4 to shoot videos, in the video mode, Canon 5D4 also added the first functions reflected in 80D, namely, the adjustment of video autofocus speed and the adjustment of short film servo focusing sensitivity.

But if you want to turn on these two functions, first of all, you should be careful not to choose "face recognition+tracking" mode in autofocus mode, because these two functions are not available in this mode.

As the name implies, the autofocus speed is the speed of diagonal switching when the focal length is manually changed, providing ten levels of adjustment. Different effects can be achieved by adjusting the shutter of autofocus speed. In the video below, we can see the contrast between the two most extreme autofocus speeds.

This sensitivity refers to the sensitivity of identifying the intruded object when the focused subject has been determined. If you want to keep the original focus object unchanged, you can choose to adjust to the left (that is, insensitive), or you can let everyone see the difference between the two limits through a video.

Finally, we will talk about the practical screen capture function in 4K video function. As we all know, a frame of 4K video is equivalent to a still photo with 8.8 million pixels. In the past, many cameras with 4K function had video screen capture function (such as Panasonic GH4). Under some conditions, in order to ensure that the shooting is not missed by some fleeting pictures, it can be achieved by shooting a video and then intercepting a single frame.

but

Canon 5D4 can achieve 4K 30P video shooting, which is equivalent to having continuous shooting capability of about 30 frames per second, which is faster than 7 frames per second when shooting full-size still photos, and can capture photos more efficiently. Find a 4K video in the play function. Press Play and Pause at any time to see the picture below.

The icon above the clip flag is an option to clip a single-frame video.

Finally, a photo with 4096 X 2 160 resolution can be obtained without affecting the original video. The still photo will be saved as a new photo, but the only regret is that this 8.8 megapixel photo does not carry EXIF information.

"

"5. Add the WiFi transmission function.

Canon also added WiFi function to 5D Mark IV this time. Wireless connection with smart phone or tablet computer can remotely display and shoot in real time, and can also browse and transmit the shot images. Connect a laptop computer and printer that support Wi-Fi, and you can perform various operations or print wirelessly. You can also back up the image to the Canon image storage connection station CS 100, or upload the image directly from the camera to the cloud storage through "Canon image upload".

After WiFi is enabled, select the connection method. Then open the Canon Camera Connect application in the mobile device to connect with the camera.

In addition to simply pressing the shutter, the remote camera can also adjust the aperture, ISO and exposure compensation in real time on the mobile device, which is very practical.

In addition to being able to remotely control the camera to obtain a more flexible shooting angle. You can also transfer the photos taken to smart devices in time, share them with others or upload them to social networks.

"The second-generation 6 1 point focusing system has better focusing performance.

Canon 5D4 adopts the same 6 1 point high-density mesh array autofocus II focusing system as EOS- 1D X Mark II, including 4 1 cross focusing point, and all 6 1 points support the aperture F8, which means that all focusing points can also be used with a constant F4 lens and dual rangefinders.

Canon 5D4' s 6 1 point focusing system has a larger coverage than 5D3' s autofocus point. The longitudinal expansion of the central area is about 8.6%, and that of the peripheral area is about 24%. It can capture the subject more effectively and improve the mobility of shooting dynamic subjects.

At the same time, 5D4 is also equipped with about

1.5 million pixel RGB+ infrared photometry sensor. The high pixel photometry sensor can capture the viewfinder image as an image and detect the color and face of the subject. Rich subject information is transmitted to the automatic system to improve the accuracy of automatic exposure, automatic white balance and automatic focusing. The metering sensor is divided into 252 metering zones. DIGIC 6 digital image processor (equipped with a separate processor) and new photometric algorithm are used to analyze the color distribution, subject color and motion in the picture, which improves the performance of subject recognition. Built-in data obtained by rg b++ infrared photometric sensor with about 1.5 million pixels, EOS iSA system.

Intelligent object analysis system)

It can not only judge the brightness of the subject, but also analyze the position and color of the subject. The information obtained from EOS iSA system (intelligent object analysis system) will be used in autofocus systems such as EOS iTR AF (intelligent tracking and recognition autofocus) to improve the ability of face recognition. Measurement of focusing performance: This time, taking the equestrian events as an opportunity, we tested the focusing and continuous shooting functions of Canon 5D4. Through the test, it is found that the increase of focus area is really helpful to shoot sports themes. And the continuous shooting speed of 7 frames per second is enough for shooting equestrian subjects. The success rate of automatic face recognition is very high in some static scenes, and it is certainly impossible to achieve the success rate of 100% in high-speed motion.