DxOMark published their Sony a7C sensor review and test results – Sony a7C’s 24.2MP full-frame exmor R BSI sensor achieved an excellent overall DxOMark sensor score of 95 points (just 1 point behind the Sony a7 III), with a combination of 25 bits color depth, 14.7 EV dynamic range, and 3407 ISO low-light score.
Sony a7C Key Features:
- 24.2MP Full-Frame Exmor R BSI Sensor
- BIONZ X Image Processor
- UHD 4K30p Video with HLG & S-Log3 Gammas
- 693-Point Hybrid AF System
- 2.36m-Dot OLED Electronic Viewfinder
- 3.0″ 921.6k-Dot Vari-Angle Touchscreen
- 5-Axis In-Body Image Stabilization
- Shooting Up to 10 fps, ISO 50-204800
- Bluetooth and Wi-Fi Connectivity
Image quality compared:
Adopting a different design using memory built into the sensor to lessen distortion when using the electronic shutter, even the Sony A9 II is close in sensitivity to the A7C and to others using the standard 24 MP BSI-CMOS. The main concession here with the A9 II’s stacked BSI CMOS is in maximum dynamic range, where it’s a little less at the lowest ISO values.
When compared with the 20 MP Canon EOS R6, the BSI-CMOS in the A7C has around a 1/3 stop improvement in sensitivity overall, with improvements in both maximum color depth and maximum dynamic range at low ISOs. At higher sensitivity settings the benefits between the Sony and Canon sensors are less conspicuous.
Against the new 45 MP sensor in the Canon EOS R5, the Sony A7C sensor’s overall performance is practically identical; however, there are obvious differences in noise levels and thus the response in terms of dynamic range and color depth.
Conclusion from DxOMark:
Featuring a rangefinder-style body, the Sony A7C is an intriguing step between the Sony A6xxx series and the DSLR-style A7xxx models. While targeting the hybrid stills and video market, the design means it’s likely to find favor with vloggers and others looking for a highly compact and portable full-frame camera, and it’s an attractive alternative to the larger A7 III and A9 models. At launch, the price is advantageous as well.
The BSI-CMOS in the Sony A7C performs well altogether. The results are practically identical to the sensors in the Sony A7 III and A9 II, and it produces a nice balance between maximum dynamic range at low ISOs and maintaining a usefully wide dynamic range at higher ISO settings. And the same can be said for color depth. All combined, the Sony A7C is an attractive option for landscape, travel, wedding, and portrait photographers, while the rangefinder-style body should also appeal to the traditional street photographer.