Reasons to choose D40x
Released in 2007, D40x has about 373 mm² of sensor area, 10.2 MP effective resolution, and a 522 g body. Use these values to narrow the field, not as an overall image-quality score.
Side-by-side comparison
Nikon D40x
vs Sony Alpha DSLR-A550
VS
Sensor area
373 mm²
D40x365 mm²
Alpha DSLR-A550- Area ratio
- 1.02:1
- Absolute difference
- 8 mm²
- Relative difference
- 2.1%
The D40x 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
D40xMetricAlpha DSLR-A550
10.2 MPEffective pixels14.2 MP
23.6 × 15.8Sensor23.4 × 15.6
6.05 µmPixel pitch5.07 µm
36.56 µm²Pixel area25.71 µm²
2.74 MP/cm²Pixel density3.89 MP/cm²
1.52Crop factor1.54
—Maximum video—
522 gWeight632 g
SDHC, Secure DigitalStorageSD/ SDHC, Memory Stick Pro Duo/ Pro-HG Duo
Nikon EN-EL9 Lithium-Ion included Li-ion batteryBatteryLithium-Ion NP-FM500H rechargeable 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 D40x has the larger sensor area. The D40x has the lighter body. The Alpha DSLR-A550 has the higher effective resolution. The Alpha DSLR-A550 is the newer release. Also consider the lens system and subjects you shoot.
Reasons to choose Alpha DSLR-A550
Released in 2009, Alpha DSLR-A550 has about 365 mm² of sensor area, 14.2 MP effective resolution, and a 632 g body. Use these values to narrow the field, not as an overall image-quality score.