This calculator to determines the slowest shutter speed
to prevent camera shake or blurry pictures for hand held
photography. The general rule of thumb to prevent camera
shake is set the shutter speed to one over the focal length
of the lens for 35mm film. For example, a 50mm lens would
require a shutter setting of 1/50 or faster. For crop
bodies the shutter speed is one over the equivalent focal
length. The equivalent focal length is the focal length
time the crop factor. Taking the same 50mm lens on a 1.6
crop body would yield a setting of 1/(50 x 1.6) or 1/80.
This calculator also take into anti-shake technology.
Canon technology goes by Image Stabilization (IS) and
Nikon goes by Vibration Reduction (VR). The calculator
provides tables and bar charts for 0 to 4 stops of stabilization.
Note, image stabilization and vibration reduction do not
prevent subject motion blur.
Remember, this calculator give a rough estimate of the
minimum shutter speed. Some people will have steadier
hands than others. Some people are simply more prone to
shaking the camera.
Note, if you manually enter the lens
focal length or crop factor, the ENTER, CALCULATE or RETURN
keyboard button needs to be pressed. This will cause the
calculations to be updated.
Lens focal length
The focal length of your lens
in millimeters. Note, do not multiply the focal
length by the camera body's crop factor. This calculator
automatically adjusts and calibrates the lens.
||The crop factor is used to update the lens for length
to the equivalent focal length. The crop factor is
a ratio based on 35mm film and image sensor size.