Reasons to choose a1
Released in 2021, a1 has about 862 mm² of sensor area, 50.1 MP effective resolution, and a 737 g body. Use these values to narrow the field, not as an overall image-quality score.
Side-by-side comparison
Sony a1
vs Sony A7 IV
VS
Sensor area
862 mm²
a1858 mm²
A7 IV- Area ratio
- 1:1
- Absolute difference
- 4 mm²
- Relative difference
- 0.4%
The a1 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
a1MetricA7 IV
50.1 MPEffective pixels33 MP
35.9 × 24Sensor35.9 × 23.9
4.15 µmPixel pitch5.1 µm
17.2 µm²Pixel area26 µm²
5.81 MP/cm²Pixel density3.85 MP/cm²
1Crop factor1
7,680 × 4,320Maximum video3,840 × 2,160
737 gWeight658 g
SD/SDHC/SDXC, CFexpressStorageSD/SDHC/SDXC, CFexpress A
NP-FZ100 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 a1 has the larger sensor area. The A7 IV has the lighter body. The a1 has the higher effective resolution. The a1 and A7 IV were both released in 2021. Also consider the lens system and subjects you shoot.
Reasons to choose A7 IV
Released in 2021, A7 IV has about 858 mm² of sensor area, 33 MP effective resolution, and a 658 g body. Use these values to narrow the field, not as an overall image-quality score.