Reasons to choose Optio A40
Released in 2007, Optio A40 has about 42 mm² of sensor area, 12 MP effective resolution, and a 170 g body. Use these values to narrow the field, not as an overall image-quality score.
Side-by-side comparison
Pentax Optio A40
vs Pentax Optio S10
VS
Sensor area
42 mm²
Optio A4038 mm²
Optio S10- Area ratio
- 1.12:1
- Absolute difference
- 5 mm²
- Relative difference
- 12.1%
The Optio A40 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
Optio A40MetricOptio S10
12 MPEffective pixels10 MP
7.53 × 5.64Sensor7.11 × 5.33
1.88 µmPixel pitch1.95 µm
3.54 µm²Pixel area3.79 µm²
28.26 MP/cm²Pixel density26.39 MP/cm²
4.6Crop factor4.87
—Maximum video—
170 gWeight110 g
Internal storageStorageSDHC, Secure Digital
Lithium-Ion rechargeable Li-ion batteryBatteryLithium-Ion rechargeable 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 Optio A40 has the larger sensor area. The Optio S10 has the lighter body. The Optio A40 has the higher effective resolution. The Optio A40 and Optio S10 were both released in 2007. Also consider the lens system and subjects you shoot.
Reasons to choose Optio S10
Released in 2007, Optio S10 has about 38 mm² of sensor area, 10 MP effective resolution, and a 110 g body. Use these values to narrow the field, not as an overall image-quality score.