Extended shutter speeds
If the shutter speeds are further reduced information about the subject is eventually lost and the effect of movement may disappear. The technique of very long exposures is often explored in landscape photography where the photographer wants to record the passage of weather or water. For very long exposures the camera can be mounted on a tripod and the shutter fired using a cable release or via a shutter delay feature. Small apertures in combination with an image sensor set to a low ISO and light reducing filters such as a neutral density filter or polarizing filter will extend the shutter speed to seconds or even minutes.
When using exposures of longer than one second increased levels of noise may become apparent with many image sensors (especially the smaller sensors fitted to most prosumer digicams). Test the digital camera you intend to use for any long exposures to establish acceptable levels of noise at extended exposures.
Munish Khanna is a well experienced creative photographer based in Delhi, India
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