Pentax K-X - Manual (Page 93)

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Dynamic range is the ratio that indicates the light level expressed by the
CMOS sensor pixels from bright areas to dark areas. The larger it is, the
better the whole range from dark to bright areas will appear in the picture.
By expanding the dynamic range, you can expand the light level
expressed by the CMOS sensor pixels, making it more difficult for bright
area to occur in the image.
To expand the dynamic range, make the settings in [D-Range Setting] of
the [A Rec. Mode 1] menu. (p.189)
• When n (Stage Lighting)/l (Night Snap) in H (Scene) mode or C
(Movie) mode is selected, the sensitivity is fixed to AUTO and cannot be
changed.
• When the mode dial is set to K (Sensitivity Priority) or a (Manual), [AUTO
Setting] is not displayed.
• The sensitivity range can be expanded to a range of ISO 100 to 12800 when
[3. Expanded Sensitivity] in the [A Custom Setting 1] menu (p.81) is set to
[On]. In this case, the following restrictions apply.
- When the sensitivity is set to ISO 100, bright areas are more likely to occur.
- When [Highlight Correction] is set to [On] (p.189), the minimum sensitivity
is ISO 200.
• Captured images may show more noise if a higher sensitivity is set. You can
reduce image noise by setting [14. High-ISO NR] in the [A Custom Setting 2]
menu. (p.92)
• You can set whether to lock the sensitivity adjustment to increments of 1 EV
or to coordinate it with the EV steps (p.108) in [2. Sensitivity Steps] of the
[A Custom Setting 1] menu (p.81).
Expanding the Dynamic Range