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Top of camera controls (right)

Just three controls on the top right side of the K100D, the power / DOF preview switch, the shutter release button and the exposure compensation / aperture value button. At the back 'under your thumb' are the command dial and Auto Exposure lock button.

Button Controls

Av Exposure compensation / Aperture value

Hold this button and turn the command dial to set exposure compensation (-2.0 to +2.0 EV in 0.3 or 0.5 EV steps) - not available in all modes. In manual exposure mode hold this button and turn the command dial to set aperture, turn the dial on its own to set shutter speed.
AE-L Auto Exposure Lock

Locks the exposure at the currently metered point, this is automatically reset after approximately 20 seconds.

Top of camera controls (left)

On the left top of the camera is the exposure mode dial. The AUTO PICT mode is indicated as the 'best choice' for novice users and the green line extending around the edge of the dial indicates the picture modes automatically selected in AUTO PICT. You can manually select one of the six picture modes, additional scene modes or normal SLR exposure modes. When you turn the exposure mode dial the camera will indicate the selected mode on the LCD monitor along with a brief description.

Exposure Mode Dial

AUTO PICT

Auto Picture

The K100D's "auto" mode is subtly different than that found on other digital SLR's. While it can still be considered a 'point and shoot' mode it does actually try to automatically decide which of four scene modes best suits the kind of shot you are taking (the chosen mode is shown on the viewfinder status bar), if it can't match the parameters of a particular scene it instead shoots in 'Normal' mode. The four modes available to the camera automatically are Portrait, Landscape, Macro and Moving Object (sports).

P Program Auto Exposure

In this mode the camera automatically selects aperture and shutter speed based on the current metered exposure value, exposure compensation and selected ISO sensitivity. Note that the K100D does not have program shift or 'hyper program'.
Tv Shutter Priority Exposure

In this mode you select the shutter speed and the camera will calculate the correct aperture depending on metered exposure, exposure compensation and ISO sensitivity. Turn the front command dial to select shutter speed (0.3 or 0.5 EV steps). The camera automatically calculates the appropriate aperture for correct exposure.

1/4000, 1/3200, 1/2500, 1/2000, 1/1600, 1/1250, 1/1000, 1/800, 1/640, 1/500, 1/400, 1/320, 1/250, 1/200, 1/160, 1/125, 1/100, 1/80, 1/60, 1/50, 1/40, 1/30, 1/25, 1/20, 1/15, 1/13, 1/10, 1/8, 1/6, 1/5, 1/4, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.3, 1.6, 2, 2.5, 3.2, 4, 5, 6, 8, 10, 13, 15, 20, 25, 30 sec
Av Aperture Priority Exposure

In this mode you select the aperture and the camera will calculate the correct shutter speed depending on metered exposure, exposure compensation and ISO sensitivity. Turn the rear command dial to select aperture (0.3 or 0.5 EV steps). The camera automatically calculates the appropriate shutter speed for correct exposure. (Exact range depends on lens used)
M

Manual Exposure

In this mode you select the aperture and the shutter speed from any combination of the above. Turn the command dial to select shutter speed, hold the exposure compensation / aperture value button and turn the command dial to select aperture.

B Bulb Exposure

In this mode the shutter is open for as long as you press the shutter release button. Select aperture by turning the command dial.
Portrait

Optimal for capturing portraits. * (Larger apertures for shallow depth of field)
Landscape

Deepens the focus range, emphasizes contour and saturation of trees and the sky, and produces a bright image. * (Smaller apertures for more depth of field)
Macro

Lets you take vibrant pictures of flowers and other small subjects at short distances. *
Moving Object

Lets you take sharp pictures of a quickly moving subject, such as a sporting event. * (Prioritizes faster shutter speeds)
Night Scene Portrait

Lets you capture people against a night view or dusk. * (Allows flash slow sync; slow exposures in combination with flash)
Flash off

The built-in flash is deactivated. Other settings are the same as 'Normal' mode. *
SCN Scene

Lets you select from 8 additional shooting scenes depending on the shooting conditions. * (Night Scene, Surf & Snow, Text, Sunset, Kids, Pet, Candlelight, Museum).

* Description of picture modes taken from the Pentax K100D user manual with permission. Note that each scene mode has its own set of image parameters (color saturation, tone etc.) which aren't detailed by Pentax.

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