Reasons to choose EOS R
Released in 2018, EOS R has about 864 mm² of sensor area, 30.3 MP effective resolution, and a 660 g body. Use these values to narrow the field, not as an overall image-quality score.
Side-by-side comparison
Canon EOS R
vs Sony Alpha A7 III
VS
Sensor area
864 mm²
EOS R847 mm²
Alpha A7 III- Area ratio
- 1.02:1
- Absolute difference
- 17 mm²
- Relative difference
- 2%
The EOS R 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 RMetricAlpha A7 III
30.3 MPEffective pixels24.2 MP
36 × 24Sensor35.6 × 23.8
5.34 µmPixel pitch5.92 µm
28.51 µm²Pixel area35.01 µm²
3.51 MP/cm²Pixel density2.86 MP/cm²
1Crop factor1.01
3,840 × 2,160Maximum video3,840 × 2,160
660 gWeight650 g
SD/SDHC/SDXCStorageSD/SDHC/SDXC, MS Duo/Pro Duo/Pro-HG Duo
LP-E6N 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 R has the larger sensor area. The Alpha A7 III has the lighter body. The EOS R has the higher effective resolution. The EOS R and Alpha A7 III were both released in 2018. Also consider the lens system and subjects you shoot.
Reasons to choose Alpha A7 III
Released in 2018, Alpha A7 III has about 847 mm² of sensor area, 24.2 MP effective resolution, and a 650 g body. Use these values to narrow the field, not as an overall image-quality score.