Pentax Optio T10 - Manual (Page 64)

Focusing
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Focusing in Dimly Lit Locations
By default, the camera is set to use the auxiliary AF light for easier
focusing in dimly lit locations (p.66).
Preventing Camera Shake and Blurring of the Subject
There are several solutions to prevent inadvertent camera movement
(camera shake) and blurring of the subject. Increasing the ISO sensitivity
(p.67) or using the flash (p.56) is one solution as the camera then takes
pictures at higher shutter speeds. Higher shutter speeds are effective for
preventing both camera shake and blurring of the subject.
You can check if camera shake is likely to occur when f (camera
shake warning) appears on the LCD monitor. Using a tripod and the self-
timer (p.69) or remote control function (p.70) is recommended especially
when camera shake is likely to occur.
Changing the Depth of Field
By zooming in on your subject from a close distance, you can narrow the
depth of field and create a blurred background (p.45).