Reasons to choose Optio A20
Released in 2006, Optio A20 has about 25 mm² of sensor area, 10 MP effective resolution, and a 125 g body. Use these values to narrow the field, not as an overall image-quality score.
Side-by-side comparison
Pentax Optio A20
vs Pentax Optio E40
VS
Sensor area
25 mm²
Optio A2025 mm²
Optio E40- Area ratio
- 1:1
- Absolute difference
- 0 mm²
- Relative difference
- 0%
The Optio A20 and Optio E40 have the same sensor area. Compare pixel density, sensor architecture, and release generation to understand likely image-quality differences.
These cameras were released 1 years apart. Consider sensor generation when comparing pixel metrics.
Key specification differences
Optio A20MetricOptio E40
10 MPEffective pixels8.1 MP
5.75 × 4.32Sensor5.75 × 4.32
1.58 µmPixel pitch1.75 µm
2.48 µm²Pixel area3.07 µm²
40.26 MP/cm²Pixel density32.61 MP/cm²
6.02Crop factor6.02
—Maximum video—
125 gWeight130 g
Secure DigitalStorageSDHC, Secure Digital
Lithium-Ion rechargeable Li-ion batteryBatteryAA (2) batteries (NiMH recommended)
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 Optio A20 and Optio E40 have the same sensor area. The Optio A20 has the lighter body. The Optio A20 has the higher effective resolution. The Optio E40 is the newer release. Also consider the lens system and subjects you shoot.
Reasons to choose Optio E40
Released in 2007, Optio E40 has about 25 mm² of sensor area, 8.1 MP effective resolution, and a 130 g body. Use these values to narrow the field, not as an overall image-quality score.