Reasons to choose EOS R6
Released in 2020, EOS R6 has about 858 mm² of sensor area, 20.1 MP effective resolution, and a 680 g body. Use these values to narrow the field, not as an overall image-quality score.
Side-by-side comparison
Canon EOS R6
vs Sony a7S III
VS
Sensor area
858 mm²
EOS R6847 mm²
a7S III- Area ratio
- 1.01:1
- Absolute difference
- 11 mm²
- Relative difference
- 1.3%
The EOS R6 has the larger sensor area. More area usually means greater light-gathering potential, though real image quality still depends on sensor architecture and generation.
Key specification differences
EOS R6Metrica7S III
20.1 MPEffective pixels12.1 MP
35.9 × 23.9Sensor35.6 × 23.8
6.53 µmPixel pitch8.37 µm
42.69 µm²Pixel area70.02 µm²
2.34 MP/cm²Pixel density1.43 MP/cm²
1Crop factor1.01
3,840 × 2,160Maximum video4,264 × 2,408
680 gWeight614 g
SD/SDHC/SDXC/UHS-IIStorageSD/SDHC/SDXC/MS Pro Duo/CFexpress
LP-E6NH lithium-ion battery Li-ion batteryBatteryNP-FZ100 lithium-ion battery Li-ion battery
Amber marks the value that is generally preferable in this comparison context. It is not an overall camera score.
How to choose between these cameras
The EOS R6 has the larger sensor area. The a7S III has the lighter body. The EOS R6 has the higher effective resolution. The EOS R6 and a7S III were both released in 2020. Also consider the lens system and subjects you shoot.
Reasons to choose a7S III
Released in 2020, a7S III has about 847 mm² of sensor area, 12.1 MP effective resolution, and a 614 g body. Use these values to narrow the field, not as an overall image-quality score.