Long-exposure involves using a long-duration shutter speed to sharply capture the stationary elements of images while blurring, smearing, or obscuring the moving elements.
It’s one of my favourite techniques, especially when I make images at sea or at rivers. It freezes the water and creates a beautiful silky look. In order to be able to keep the shutter open for seconds or minutes during daylight without overexposing the image, a steady tripod and ND filters are needed. For daylight images I use a 10 stops ND filter.
Most cameras have a 30 seconds limit on exposure, so in order to get longer times you need to use a shutter remote (cable or wireless). This also helps keeping your camera completely still in order to get a sharp image!
About how long you should keep you shutter open, it depends on the look you want to achieve. Personally on rivers and waterfalls I keep it just at 2 or 3 seconds so that I can get the silky look but also have some motion in the water flow. At the sea I tend to use much longer times.
More long exposure images on a next post!
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