The blurring effect of camera shake is caused when the lens is moved while the shutter is open. Often seen when holding a camera in low light and high zoom situations.

Remember that most cameras have slow lenses, and the potential for camera shake increases as you zoom in.

The solution is to use a safe shutter speed or flash to freeze motion. Changing to a wide angle lens also helps, and remember a fast speed film can also buy you a few stops of light.

Simplified Safe Shutter Speed Chart
Zoom
shakey hands
steady hands
wide angle
1/60
1/30
medium wide
1/125
1/60
zoom
1/250
1/125
high zoom
1/500
1/250

>>>more information about camera shake

SimCam: Camera Shake
The first SimCam is wide-angle, and the second is zoom. Set both cameras to 1/60 f4 and take a picture.

At 1/60 shutter speed, the zoom SimCam is already beginning to show camera-shake, but the wide angle exposure is still sharp.

Try stepping up the shutter speed on the zoom SimCam until the camera shake disappear. Then go the other way and watch how it increases.

Sometimes the only way to get the exposure you want is to increase the film speed.

Wide Angle Zoom
Shutter:
Aperture:
Shutter:
Aperture:
final exposure: final exposure: