In  Intro to Digital Photography, I teach a lot of basics. I point out the effects of changing this, changing that, changing the other, and how best to take advantage of the result. One thing we discussed recently was shutter speed, and everyone had fun waving their hands in front of each other at 1/8th of a second, then at 1/500th of a second, to get a clearer idea how shutter speed is one key component in building an image.

Since I live in the world of photographing people (mostly) for a living, I tend to come down on the side of faster shutter speeds. Lots of people are fast, from toddlers to professional athletes, and most of the time I try to freeze the action of their movements to illustrate what they are doing for our readers.

One of my students asked me, “Richard, what’s a good shutter speed if I want to show movement?”

It’s a great question with a not-as-great answer: practice. Every time we try to illustrate movement, the scene and subjects are a little different, so my advice is to keep experimenting, but with the notion in mind that in photography, a half a second is a really long time, and a minute is an eternity.

Then, as luck would have it, I was at Ada’s Wintersmith Park recently, looking for a feature photo, which I found (of a young lady doing her daily run up and down the steps of the amphitheater there), and noticed that the lake was high. Sure enough, the stream below the lake was flowing.

Anyone who has tried to photograph running water in daylight has experienced the same frustration: the relatively fast shutter speeds dictated by the brightness of the daytime light create an image that looks wrong. It is neither amazingly crisp, nor does it seem to express how water flows.

Knowing this, I made a plan to return to the park at dusk. I set up my Nikon D7100 with the AF-S Nikkor 18-200mm zoom on my best tripod as close as I could get without getting wet. I wanted to create as much blur as possible in the swiftly moving water, so I started at 30 seconds at f/22 and ISO 200, but that was entirely too dark. The only number I needed to keep was 30 seconds, so I bumped up to ISO 400 and f/11, and that was just right. The scene was illuminated by fading evening sky through the woods, and orange streetlights on the walking trail. To add an opposite color, I “painted” with my multicolor flashlight set to green.