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Sony a7 III vs a9 Comparison

Optics
Video
Features
Storage & Battery

Sony a7 III

Sony A7 III camera
Winner!
81%

Sony a9

Sony a9 Camera image
80%
Sony a7 III
vs
Sony a9
Price
Brand
Sony
Sony
Model
a7 III
a9
Released
2018
2017
Announcement Date
February 27, 2018
April 19, 2017
Camera Type
Mirrorless
Mirrorless
Camera Size
Camera Weight

The Sony a7 III and Sony a9 both scored highly in our evaluation, making them excellent mirrorless cameras. Both cameras were announced in 2017-2018 and share similar dimensions, with the a7 III measuring 127 x 96 x 74mm and the a9 at 127 x 96 x 63mm. They also have comparable weights, with the a7 III weighing 650g and the a9 at 673g. The a9 boasts a slightly slimmer design, which could be an advantage for some users.

Taking these factors into account, both cameras offer excellent performance, but the a7 III may be the better choice for those on a budget. Meanwhile, the a9’s slimmer design might appeal to those who prioritize portability.

Sony a7 III vs a9 Overview and Optics

The Sony a7 III and the Sony a9 have identical scores for optics, both receiving an 81/100. This similarity is reflected in their shared specifications. Both cameras have 24.2 megapixels, CMOS sensor types, Bionz X processors, full-frame sensor sizes, Sony FE lens mounts, and image stabilization. Despite these commonalities, there are differences that set them apart.

The Sony a9 has a faster shooting speed of 20 frames per second, compared to the a7 III’s 10 frames per second. This advantage allows the a9 to capture fast-moving subjects more effectively. Additionally, the a9’s sensor has a lower DXOMARK score of 92, compared to the a7 III’s score of 96. The lower DXOMARK score indicates that the a9’s sensor is not as efficient at capturing image details as the a7 III’s sensor.

Conversely, the Sony a7 III has a higher DXOMARK score for its sensor, which means it can capture better image quality and details than the a9. However, its slower shooting speed of 10 frames per second may not be suitable for capturing fast-moving subjects.

Considering these differences, the Sony a9 is better suited for photographers who prioritize capturing fast-moving subjects, while the Sony a7 III is more appropriate for photographers who value image quality and detail. Despite their identical optics scores, these cameras cater to different needs and preferences.

Optics
Optics
81%
81%
Megapixels
24.2 MP
24.2 MP
Image Resolution
6000 x 4000 px
6000 x 4000 px
Sensor Type
CMOS
CMOS
Sensor Size
23.8 x 35.6 mm
23.8 x 35.6 mm
Sensor Format
Full Frame
Full Frame
Frame Rate
10 fps
20 fps
Lens Mount
Sony FE
Sony FE
Image Processor
Bionz X
Bionz X
Aspect Ratio
3:2
3:2
Minimum ISO (Native)
100
100
Maximum ISO (Native)
51,200
51,200
Minimum ISO (Expanded)
50
50
Maximum ISO (Expanded)
204800
204800
Minimum Shutter Speed
30 s
30 s
Maximum Shutter Speed
1/ 8000 s
1/ 8000 s
Autofocus Points
693
693
In-body Stabilization
Viewfinder Type
Electronic
Electronic
Viewfinder Resolution
2,359,296 dots
3,686,400 dots

Sony a7 III vs a9 Video Performance

The Sony a7 III and the Sony a9 are similar in terms of video capabilities, but the a7 III takes the lead. They share several video specifications, making them equally competitive in this aspect.

Both cameras offer a maximum video resolution of 4K, with dimensions of 3840 x 2160, ensuring high-quality video output. Additionally, they both have a maximum video frame rate of 30fps, which is sufficient for capturing smooth motion in video recordings. Only the a7 III has built-in time-lapse functionality.

Video
Video
56%
56%
Video
Max Video Resolution
4K
4K
Max Video Dimensions
3840 x 2160 px
3840 x 2160 px
Max Video Frame Rate
30 p
30 p
Time-Lapse Built In
Video File Format
XAVC S, AVCHD
XAVC S, AVCHD Ver. 2.0, MP4

Sony a7 III vs a9 Features and Benefits

The Sony a9 slightly outperforms the Sony a7 III in features, scoring 83/100 compared to the a7 III’s 81/100. Both cameras share several specifications, including a 3-inch screen size, touchscreen capabilities, flip screen, GPS absence, and WIFI and Bluetooth connectivity.

The Sony a9 surpasses the a7 III in screen resolution, boasting 1,440,000 dots compared to the a7 III’s 921,600 dots. This higher resolution provides a clearer and more detailed image preview and playback experience for photographers.

On the other hand, the Sony a7 III does not have any features that make it superior to the Sony a9. However, it is worth mentioning that the a7 III comes close to the a9’s performance, with only a 2-point difference in feature score. This similarity indicates that the a7 III is still a competitive camera, offering most of the essential features that the a9 provides.

Considering these points, the Sony a9 is the better camera in terms of features. Its higher screen resolution offers an improved image preview experience, making it the more appealing option for photographers who prioritize this aspect. However, the Sony a7 III is not far behind, and its near-identical performance should not be overlooked. Ultimately, the choice between these two cameras will depend on individual preferences and priorities, with the a9 being the top choice for those who value screen resolution above all.

Features
Features
81%
83%
Built-in Flash
External Flash
GPS
Weather Sealing
Screen Type
LCD
LCD
Touch Screen
Screen Size
3"
3"
Screen Resolution
921,600 dots
1,440,000 dots
Flip Screen
Live View
Wi-Fi
Bluetooth

Sony a7 III vs a9 Storage and Battery

The Sony a7 III outperforms the Sony a9 in storage and battery with a score of 81 compared to 65. Both cameras have two memory card slots and accept SD/SDHC/SDXC cards. However, the a7 III also supports Memory Stick Duo/Pro Duo/Pro-HG Duo cards, while the a9 is only UHS-II compatible.

The a7 III’s battery life is superior at 750 shots, 100 more than the a9’s 650 shots. Both cameras use the NP-FZ100 battery type and do not have USB charging. The longer battery life of the a7 III offers an advantage for extended shooting sessions.

The a9 does not provide any notable advantages in storage and battery when compared to the a7 III. Therefore, the a7 III is the better choice for those prioritizing storage and battery performance.

Storage and Battery
Storage and Battery
81%
65%
Memory Card
SD / SDHC / SDXC, Memory Stick Duo / Pro Duo / Pro-HG Duo
SD / SDHC / SDXC (UHS-II compatible)
Dual Memory Card Slots
Battery Type
NP-FZ100
NP-FZ100
Battery Life
750 shots
650 shots
USB Charging
DXOMARK Scores
Sensor scores tested by DXOMARK
Overall Score
96%
92%
Portrait (Color Depth)
25.1 bits
24.9 bits
Landscape (Dynamic Range)
14.7 EVs
13.3 EVs
Sports (Low-Light ISO)
3722
3517
Scores
Main Features
84%
N/A
Extra Features
72%
N/A
Construction and Durability
67%
N/A
Handling and Ergonomics
67%
N/A
Value for Money
110%
N/A
Total Score
81%
N/A

Alternatives to the Sony a7 III and a9

Sony a7 III vs a9 Comparison image.

Are you still undecided about which camera is right for you? Have a look at these popular comparisons that feature the Sony a7 III or the Sony a9:

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