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Like most point&shoot cameras, the A3100 does not give you direct control over the shutter speed. You're expected to just point the camera and shoot, without worrying about such niggling details.
You can gain some control over the shutter speed by changing the scene mode. For example, portrait mode attempts to reduce the depth of field by opening the aperture, which results in a faster shutter speed. Conversely, landscape mode attempts to increase the depth of field by closing the aperture, which results in a slower shutter speed.
Like many point&shoot cameras the JZ300 doesn't give you direct control over the shutter speed; you're expected to just point and shoot.
You can indirectly affect the shutter speed by changing scene modes. For example the sports mode will try to use faster shutter speeds while the landscape mode will narrow the aperture for greater depth of field resulting in a slower shutter speed.
That depends on the exposure mode. In any of the automatic point&shoot modes you have no control over the shutter speed, the camera sets what it thinks is the proper shutter speed. In the P (Program AE) mode you can adjust the shutter speed by pressing the +/- button. In the S (Shutter Priority) and M (Manual) modes you control the shutter speed by pressing the +/- button and then using the cursor-up/down buttons.
On most indoor shots the shutter speed will normally be 1/30 if you need or want it to be faster than that the only way to do that with this camera is to set the ISO to a higher value. Page 29 of your user manual explains how to set the ISO value for the camera to allow for faster shutter speeds.
from the manual:
Using Shutter-Priority Mode 1.
Set the mode dial to S (shutter-priority) and a yellow arrowhead on the screen points to the current shutter speed. Press the jog dial and the current shutter speed turns yellow. 2. With the current shutter speed displayed in yellow, rotate the jog dial to select the speed you want to use. 3. Take the picture. If a workable aperture isn?t available for the shutter speed you?ve selected, the shutter speed indicator on the screen flashes when you press the shutter button halfway down. You can use the setting as is, or press the jog dial down to select the shutter speed again and rotate it to select a new shutter speed.