Sony Alpha 7R IV is a full-frame mirrorless camera with 61 million pixels
Today we bring you the relevant evaluation of Sony Alpha 7R IV. This is a full-frame mirrorless camera with 61 million pixels. The listed price is 26,999 yuan, and the current price is about 24,000 yuan. This camera has excellent image quality performance and good motion capture capabilities. It is a professional-grade mirrorless camera with image quality as its core.
Sony Alpha 7R IV, is currently the highest pixel camera among 135 frames. Compared with the A7R3, this camera has many upgrades in addition to the pixels. It is a professional micro-single camera with high pixels and high speed. While shooting high-quality still pictures, it also has good video shooting performance.
The biggest advantage of Sony Alpha 7R IV is the image output capability. The image output size of 61 million pixels is 9506*6336, which can output fine large-format photos. At the same time, if you use the pixel conversion multiple shooting mode, you can synthesize 240 million pixel photos in the post, and the output capability is very powerful.
Another feature of Sony Alpha 7R IV is its powerful dynamic capture capability. The camera has 567 phase focus points, covering an area of 74%, and the camera has a continuous shooting speed of 10fps, so like the A7R3, it can capture high-speed moving objects.
The camera’s video performance has also been upgraded, with two core upgrades: One is the upgrade from 5K supersampling to 6K supersampling in the Super35mm format. The most important point is that the A7R4 is the first camera that supports eye focus under video.
Overall, I gave this camera a high score of 9.2 Points, the advantage of this camera lies in its powerful image capture capability and excellent body handling experience. The disadvantage is that the camera only supports 12bit RAW at 10fps high-speed continuous shooting, and the camera still does not support full-featured touch operation.
02 fuselage design
Sony will redesign the fuselage with each generation of fuselage. Now A7R4 is Sony’s fourth-generation fuselage, which is also Sony’s fourth-generation fuselage. In the middle, the best generation body to hold.
The biggest feature of this generation is the slightly smaller size There are improvements, especially the handle part of the fuselage, becoming wider. Therefore, the holding experience of this camera is very close to that of a SLR camera, even with a large-size lens, the holding experience has been greatly improved.
The camera is added to the turntable design on the top of the body Locking design, so you can avoid accidental touch. In the design of the back button, the focus lever is replaced with a more comfortable design, which is more convenient when switching the focus point. The camera’s viewfinder uses a 5.76 million pixel OLED electronic viewfinder, which supports a maximum refresh rate of 120fps, and the display effect is quite good. However, it is worth noting that although the Sony A7R4’s display screen has been upgraded to 1.44 million pixels, it still does not support full-featured touch operation.
The camera uses dual SD card slots and two card slots Both support the UHS-II standard, so the writing speed is relatively ideal. The camera still uses the NP-FZ100 battery for power supply, and the official battery life is 670 frames when using the screen to view the view, which has excellent battery life.
Finally, Sony A7R4 uses MI electronic hot shoe, which is Said that the hot shoe can directly exchange data signals with external devices. For example, with a Sony ECM-B1M microphone, you can directly use the hot shoe as a data interaction to record digital audio signals.
03 Picture Quality Test
Sony A7R4 everyone is most concerned about the picture quality performance. Here we first take a look at the camera’s progressive sensitivity test. We have intercepted JPG files and RAW files respectively for demonstration.
Sony A7R4 Level sensitivity test
From the test, the watershed of Sony’s sensitivity is ISO 3200. Below ISO 3200, both JPG and RAW files have good sensitivity; at ISO 3200, RAW files begin to show more obvious noise, while JPG has a relatively pure image quality at ISO 6400 due to the built-in noise reduction algorithm , But there have been more losses in details.
Considering the Sony A7R4 has 61 million pixels, the noise control level of this camera is quite ideal. If compared with Sony A7R3, I think the noise control of A7R4 has a small drop, but the difference in noise control level will not exceed half a stop.
Next, let’s take a look at the latitude test of Sony A7R4. According to official data, A7R4 can reach a dynamic range of 15 stops, so we tested the camera’s ISO 100, ISO 800, ISO 3200, three Commonly used sensitivity range, take a look at the camera’s latitude performance.
ISO 100 Tolerance test
In low sense, the latitude performance of Sony A7R4 can be said to be one of the best models of 135 cameras. We can increase the exposure by 5 stops and still see no significant increase in noise. The more obvious noise will only be seen when it is upgraded to 6th gear, which is comparable to a medium format camera.
Let’s take a look at the tolerance test of ISO 800 and ISO 3200.
ISO 800 Tolerance test
Tolerance test under ISO 800
At ISO 800, a noticeable increase in noise can be seen after 4 levels of lightening. If the sensitivity is increased to ISO 3200, it can actually guarantee the available brightness range of 1-2 stops.
The last feature worth explaining is that the Sony A7R4 has a pixel conversion multiple shooting mode, that is, 16 photos can be taken by the camera, and then combined into a 240 million pixel photo with computer software, which can greatly Improve the detail resolution of photos. Here we do a simple demonstration for everyone.
This is a 240 million composite photo we simply took The full image, the resolution of the photo is 19008*12672, and the red frame is our screenshot area. We can look at the details of the photo zoomed in.
100% zoom in the photo, we can see the clear picture details . Below we can use an ordinary photograph to compare. In the above picture, the size of our screenshot is 1280*960, and if we are shooting in normal mode, the size of the screenshot is 640*480.
Sony A7R4’s pixel conversion multi-shot mode not only improves the pixels , And can greatly improve the resolution of the details of the photo. However, this system can only use computer synthesis at present, not in-camera synthesis, which is a bit regrettable.
04 focus test
The focus performance of Sony A7R4 is also powerful. The camera itself has 567 phase focus points, covering an area of 74%. And the Sony A7R4 is equipped with the latest generation of eye focusing technology, the biggest highlight is that real-time eye focusing can also be performed in the video shooting state.
Sony A7R4 has 567 phase focus points, coverage area 74%
First, let’s take a look at the focus test in continuous shooting. In the test, the eye focus can track people’s faces well, even if they encounter some occlusions, they can quickly return to the tracking state.
eye focus Follow focus test
High-speed continuous shooting focus tracking test
From the point of focus tracking sensitivity, the Sony A7R4’s eye focus is quite sensitive. Let’s take a look at the accuracy of focus tracking. The author randomly intercepted the eye details of three photos to see the success rate of shooting.
continuously intercepted In the three photos, the eyes are all in focus
Under the video shooting, the Sony A7R4’s tracking focus is more sensitive, which is very rare among the 135 cameras at present. Most digital cameras now have poor focus tracking performance during video shooting, and the video focus performance of the Sony A7R4 can be regarded as the first echelon of mainstream cameras.
Sony A7R4 video Below eye focus display
Let’s take a look at the original video of this video, and we have captured a single frame for everyone.
video screenshot, Accurate focus
Finally, let’s do a limit test. On the Changchun Air Force Open Day, we shot with a Sony A7R4 with a 200-600mm lens. In high-speed continuous shooting, the Sony A7R4 faces irregular high-speed moving objects, and the focus success rate is greatly reduced. Moreover, when matched with a 200-600mm lens, it takes a long time from the object to enter the focus area to identify the subject, which is likely to cause the initial A few out of focus. So from this point of view, the focus performance of the Sony A7R4 in high-speed continuous shooting, there is actually a lot of room for upgrading.
If facing In high-speed motion scenes, there is room for improvement in the focus performance of the Sony A7R4
Finally, there is one more point. The RAW file volume of the Sony A7R4 is relatively large, and the body pixel is high, so write cards during high-speed continuous shooting. The speed is relatively slow, even if you use the highest speed SD card, after taking the entire set of photos, it still takes a long time to write. Also, you cannot take other shots while writing, which requires attention.
05 Video Test
The performance of Sony A7R4 has been upgraded during video shooting. In addition to the eye focus just described, you can switch between the full frame area and the Super35mm area. In the Super35mm format, the Sony A7R4 has been upgraded from the previous generation of 5K oversampling to 6K oversampling.
Video viewing angle in Super35mm format
Video angle of view in full frame
For the video part, the Sony A7R4 is very good Video shooting performance. We can take a look at the video performance of Sony A7R4 through a short test video.
If we take a screenshot of a single frame, the video sharpness of Sony A7R4 is quite good. Enough to meet the needs of high-standard video shooting.
Overall under Super35mm Screen
Super35mm 100% screenshot
Of course, this camera is also equipped with S-Log2, S-Log3, HLG curve, so it can be more convenient for color correction in post-shooting. However, this camera is still not equipped with 10bit video, there are some regrets.
06 Summary and Samples
Sony A7R4 It is a 135-frame camera with the highest pixels at present. It has a very powerful static image output capability, and a relatively good video shooting capability, and the body’s dynamic capture capability is also relatively good. It is a very comprehensive mirrorless camera.
The camera’s low-sensitivity image quality and excellent latitude are the biggest highlights of the camera. 61 million pixels can play a huge advantage both in portrait shooting and landscape shooting. In addition, the camera’s focus and continuous shooting performance is relatively good, especially when shooting people, the new generation of eye focus, focusing on photos and videos are quite good.
The high-sensitivity image quality of the camera is relatively ideal, considering this It is a 61-megapixel high-pixel body, so the performance of noise control is quite good. However, the camera’s noise floor is higher than that of A7R4, so you need to pay attention when processing photos.
The video performance of the camera is slightly improved compared to the A7R3. It is a camera that focuses on taking pictures and can take into account video shooting.
Here we briefly talk about the advantages of Sony Alpha 7R IV for everyone:
61 million pixel full-frame sensor, low-sensitivity resolution can be said to be the best current 135 camera
ISO 3200 or less, the picture purity is ideal
latitude performance is quite good
For portrait shooting, the focus performance is good, eye focus video is available
The highest continuous shooting speed is 10fps, and the battery life under high-speed continuous shooting is ideal
has a good grip, especially with large lenses
The body has excellent anti-shake effect, especially Under video shooting
tracking performance is better
Some unsatisfactory points:
After adjusting the RAW file, the noise is more obvious
The LCD screen has only 1.44 million pixels, and the display effect is still not ideal.
Under high-speed continuous shooting, the focus is not ideal for high-speed moving objects
The memory card writing time is too long, and No other shooting is allowed while writing the card
Finally, let’s take a look at the real shots of this camera.
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