Which shutter speed is best?
Very slow shutter speed
A shutter speed of over a second can be used to show the effects of wind on foliage and water, or to create abstract blurs using intentional movement.
To achieve a slow enough shutter speed, you’ll need to use smaller apertures and lower ISO settings.
Shooting when light levels are lower, early in the morning and late in the evening, will help, although you may need to use an ND filter to reduce exposure time in bright conditions.
Slow shutter speed
To inject a sense of motion into panning shots, use a slow shutter speed, relative to the speed of the subject.
Here we needed a shutter speed of 1/25 sec to render the fast-moving rotor blades as a blur, while keeping a good level of sharpness in the rest of the image as we moved the camera to track the helicopter.
We were working in Aperture Priority mode, and had to dial in a small aperture of f/14 to achieve the effect.
Fast shutter speed
To completely freeze movement, you’ll need a fast shutter speed. Particularly fast-moving subjects may require shutter speeds of 1/1,000 sec or faster; to achieve this, you’ll need plenty of light, wide apertures and high ISOs.
Capturing the ripples here required an exposure of 1/400 sec at f/8.
A slower shutter speed would have meant too much blur, while a faster speed would have meant using a wider aperture and reduced depth of field.
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