In still cameras, the term shutter speed represents the time that the shutter remains open when taking a photograph. Along with the aperture of the lens (also called f-number), it determines the amount of light that reaches the film or sensor. Conventionally, the exposure is measured in units of exposure value (EV), sometimes called stops, representing a halving or doubling of the exposure.
As an example of shutter speed i've decided to include a picture taken at the wedding where the shutter speed was slowed down to 1/25 (above) contrasted with Juan a Pons photograph of a highway taken with the same shutter speed (below)
Obviously the two photographs differ considerably, one is a portrait style photo where the shutter speed being slowed has given motion blur to the second person due to their movement, whilst the centre character and primary focal point has remained still so her image is still in relatively perfect clarity. This is mirrored in Juan a Pons photograph in that the trees which are the main focal and central point again are in perfect clarity another similarity is that the secondary focal point, in this case the traffic is blurred due to the slow shutter speed and fast movement of the traffic.
There are many differences in the two images the most obvious being mine is a portrait style photo and Juan's is a landscape piece the ISO between the two also differs considerably in the ISO settings more light was taken in to accomplish the bright coloring involved in Juan's work whilst my phone camera was unable to be adjusted in that fashion so the lighting is quite low (partially due to the lack of external light sources)
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