SHUTTER SPEED
There are two main effects to changing your shutter speed:
A slower shutter speed brightens the image (lets in more light) and can cause subject movement to blur.
Faster shutter speeds makes your photos darker and can freeze movement.
You can compensate for a faster shutter speed by having a larger aperture, and/or increasing the ISO sensitivity of your camera.
On a bright day with a reflective background, a fast shutter may be achieved with a low ISO
Medium to fast shutter speed on a bright day to freeze the water. Shot with the camera in a waterproof bag
A long exposure at night time, using a tripod to allow in plenty of ambient light
A Long exposure to capture the night light, but short enough to show the tail lights from the car
A fast shutter speed is usually used for sports photography
A tripod with a slow shutter speed to deliberately blur the walkers
Long Zoom lens and fast shutter speed to freeze the dancer
Long exposure, low ISO and a tripod. Notice the ghosted pedestrians to the left of the main entrance.