Reasons to choose K-x
Released in 2009, K-x has about 373 mm² of sensor area, 12.4 MP effective resolution, and a 515 g body. Use these values to narrow the field, not as an overall image-quality score.
Side-by-side comparison
Pentax K-x
vs Pentax K20D
VS
Sensor area
373 mm²
K-x365 mm²
K20D- Area ratio
- 1.02:1
- Absolute difference
- 8 mm²
- Relative difference
- 2.1%
The K-x 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 1 years apart. Consider sensor generation when comparing pixel metrics.
Key specification differences
K-xMetricK20D
12.4 MPEffective pixels14.6 MP
23.6 × 15.8Sensor23.4 × 15.6
5.48 µmPixel pitch5 µm
30.07 µm²Pixel area25 µm²
3.33 MP/cm²Pixel density4 MP/cm²
1.52Crop factor1.54
—Maximum video—
515 gWeight800 g
SDHC, Secure DigitalStorageSDHC, Secure Digital
4 x AA batteries (Lithium, Alkaline or Ni-MH)BatteryLithium Ion (D-LI50)
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 K-x has the larger sensor area. The K-x has the lighter body. The K20D has the higher effective resolution. The K-x is the newer release. Also consider the lens system and subjects you shoot.
Reasons to choose K20D
Released in 2008, K20D has about 365 mm² of sensor area, 14.6 MP effective resolution, and a 800 g body. Use these values to narrow the field, not as an overall image-quality score.