Reasons to choose EOS 70D
Released in 2013, EOS 70D has about 338 mm² of sensor area, 20.2 MP effective resolution, and a 755 g body. Use these values to narrow the field, not as an overall image-quality score.
Side-by-side comparison
Canon EOS 70D
vs Canon EOS Rebel T3i
VS
Sensor area
338 mm²
EOS 70D332 mm²
EOS Rebel T3i- Area ratio
- 1.02:1
- Absolute difference
- 5 mm²
- Relative difference
- 1.6%
The EOS 70D has the larger sensor area. More area usually means greater light-gathering potential, though real image quality still depends on sensor architecture and generation.
These cameras were released 2 years apart. Consider sensor generation when comparing pixel metrics.
Key specification differences
EOS 70DMetricEOS Rebel T3i
20.2 MPEffective pixels18 MP
22.5 × 15Sensor22.3 × 14.9
4.09 µmPixel pitch4.3 µm
16.71 µm²Pixel area18.46 µm²
5.99 MP/cm²Pixel density5.42 MP/cm²
1.6Crop factor1.61
1,920 × 1,080Maximum video1,920 × 1,080
755 gWeight570 g
SD/SDHC/SDXCStorageSDHC, SDXC, Secure Digital
Rechargeable Li-ion Battery LP-E6 Li-ion batteryBatteryLi-Ion 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 70D has the larger sensor area. The EOS Rebel T3i has the lighter body. The EOS 70D has the higher effective resolution. The EOS 70D is the newer release. Also consider the lens system and subjects you shoot.
Reasons to choose EOS Rebel T3i
Released in 2011, EOS Rebel T3i has about 332 mm² of sensor area, 18 MP effective resolution, and a 570 g body. Use these values to narrow the field, not as an overall image-quality score.