Photo Basics–Shutter Speed
I thought that an image taken at night might better illustrate the idea that I was trying to convey.
The above image was taken at 4sec @ f/5.6, you can make out the wisps of steam as they exit the smoke stacks.
This one was taken at 8 seconds, also @f/5.6, but you can see the steam starting to extend and blur into a longer stream.
The last image I closed down the aperture to f/8 but went for a full 20 second exposure. You can see the steam is a continuous flow. The night shooting shows a more extreme use of shutter speed to create a different effect on a moving subject. The same principle is applicable to almost any moving subject, and you can adjust your exposure to give moving water (for example) a different appearance. The longer the shutter is open the more the movement will get smoothed out and look more creamy. I rather like this effect and try to use it on waterfalls and the like.
In the best light…