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 M40
VS
Sensor area
42 mm²
Optio A4027 mm²
Optio M40- Area ratio
- 1.56:1
- Absolute difference
- 15 mm²
- Relative difference
- 55.8%
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 M40
12 MPEffective pixels8 MP
7.53 × 5.64Sensor6.03 × 4.52
1.88 µmPixel pitch1.85 µm
3.54 µm²Pixel area3.41 µm²
28.26 MP/cm²Pixel density29.35 MP/cm²
4.6Crop factor5.74
—Maximum video—
170 gWeight115 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 M40 has the lighter body. The Optio A40 has the higher effective resolution. The Optio A40 and Optio M40 were both released in 2007. Also consider the lens system and subjects you shoot.
Reasons to choose Optio M40
Released in 2007, Optio M40 has about 27 mm² of sensor area, 8 MP effective resolution, and a 115 g body. Use these values to narrow the field, not as an overall image-quality score.