Pentax K-x Digital Camera Review$650.00
We used the default configuration for high ISO noise reduction in our testing, but the K-x offers some flexibility here. By default, high ISO noise reduction kicks in after ISO 800. However, through a custom menu setting, you can choose the setting to start applying noise reduction.
The noise reduction processing does have a significant impact, cutting visible noise by nearly half at ISO 1600.
We break down overall image noise into its component parts, red, blue, green, yellow and chroma (gray). If noise in one color channel is considerably higher than the others it can make noise visibility worse, but that's not the case here. More on how we test noise.
Available standard ISOs range from 200-6400, with an expanded ISO range from 100-12800. There's an Auto ISO mode, which allows the user to limit the highest acceptable setting anywhere from ISO 200-12800.