I have added this post to provide a record of a piece of work I did just prior to beginning the Art of Photography course. I have always worked on the basis that, to represent water as the eye sees it, a shutter speed of around 1/250th sec. is a good start. I wanted to be a bit clearer about shutter speeds to give a stronger impression of the water moving in a still 2D picture. In particular, I wanted to know roughly where to stop before the water lost its form and turned to 'steam'; an effect which I am usually not too keen on. The camera was set on shutter priority and mounted on a tripod.
1/350th sec. f2.8, ISO 400. This image of water was slightly more 'frozen' than it appeared to the naked eye. Unfortunately, I didn't shoot any more at around 1/250th as my main aim was to experiment with slower speeds. This may be a job for another day.
1/20th sec. f9.5, ISO 400. There is plenty of movement in this image and clear form in the water. It is accurate more than dramatic.
1/6th sec. f4.5, ISO 100. As I reduced the speeds, I also reduced the ISO number to ensure that required aperture settings were available. There is a little more impact here and the form has not completely gone.
1/4 sec. f6.7, ISO 100. The following sequence of shots shows the increasing loss of 'structure' in the water as it turns to 'steam' with slower shutter speeds.
1/2 sec. f6.7, ISO 100
1 sec. f19, ISO 100
1.5 sec. f22, ISO 100
Having completed and recorded this exercise my starting point for a shutter speed, when photographing moving water, would be somewhere between 1/20sec. and 1/4. I would only go lower than 1.5 secs. if I deliberately wanted a more cloudy, ethereal effect.
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