Pentax K-X - Manual (Page 94)

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Noise Reduction
When shooting with a digital camera, image noise (image roughness
or unevenness) becomes noticeable in the following situations.
- Shooting with a long exposure
- Shooting with a high sensitivity setting
- When the temperature of the CMOS sensor is high
You can reduce image noise by using Noise Reduction. However,
images shot with Noise Reduction will take longer to save.
Slow Shutter Speed NR
Reduces noise during long exposures.
Select [On] or [Off] in [13. Slow Shutter Speed NR] of the [A Custom
Setting 2] menu (p.81).
* When the exposure time is longer than 30 seconds, the maximum sensitivity is
set to ISO 3200 and Noise Reduction is automatically activated.
High-ISO NR
Reduces noise at high sensitivity (ISO) settings.
Select [Medium], [Low], [High] or [Off] in [14. High-ISO NR] of the
[A Custom Setting 2] menu (p.81). You can change the sensitivity
from when Noise Reduction is activated in [15. High-ISO NR Start
Level] of the [A Custom Setting 3] menu (p.82).
* When the sensitivity is set to ISO 6400 or higher, Noise Reduction is
automatically activated.
1 On
The camera determines the conditions such as the shutter speed,
sensitivity, and internal temperature, and automatically reduces
noise as necessary.
2 Off
Reduces noise only when the shutter remains open for more than
30 seconds.
1 ISO 800
Noise Reduction is activated when the sensitivity is higher
than ISO 800. (default setting)
2 ISO 400
Noise Reduction is activated when the sensitivity is higher
than ISO 400.
3 ISO 1600
Noise Reduction is activated when the sensitivity is higher
than ISO 1600.
4 ISO 3200
Noise Reduction is activated when the sensitivity is higher
than ISO 3200.