Tips For Blurring Moving Water by Todd Henson

I’ve been asked in the past how to blur moving water from rivers and waterfalls in a photograph. It all comes down to shutter speed. The slower the shutter speed the more blur in the water. Below are a number of tips to help you do this. You don’t have to follow all of these tips to blur water. Pick whichever ones you’re able to use. Just realize some of them may not get the shutter speed as slow as you’d like. That’s when you may need to try the other tips.

Stabilize Your Camera

If you want a sharp image of everything but the water you’ll first need to stabilize your camera. The best way to do this is to put it on a good tripod. If you don’t have a tripod you can try resting the camera on something stable such as a stone wall or a large rock or tree. Just be careful not to let the camera drop.

Use a Remote Shutter Release or Self-Timer

To reduce the chance of introducing shake into the camera during the exposure it’s best not to press the shutter button with your finger to start the exposure. Two options for avoiding this are a remote shutter release, or setting the camera’s self-timer such that your exposure begins some number of seconds after you press the shutter button.

Using the self-timer is the least expensive option if your camera supports it, though you will lose a little flexibility in choosing exactly when to start the exposure.

There are two options for remote shutter releases: cable releases that attach to a special connector on your camera and wireless releases. At present I use a simple cable release that just presses and optionally locks the shutter. Some higher-end cable (and wireless) releases include intervalometer features which let you take a photo every so many seconds for some period of time.

Shoot Early, Late, or on an Overcast Day

It’s best if it’s not a bright sunny day as the sunlight can blow out the white highlights in the water. Try to photograph very early or very late, before the sun is up or after it has gone down. Or pick an overcast day when clouds will hide the sun. This reduces the quantity of light in the scene, reducing the chances of blowing out highlights, and requiring a longer exposure in your camera, increasing your chances of blurring the water.

This was shot on an overcast morning. Less light meant a longer exposure. ISO 200, aperture f/36, shutter speed 15 seconds.

Adjust Your ISO

Set your ISO to the lowest setting your camera allows. The ISO controls how sensitive your camera’s sensor is to light. The lowest setting, for example, 100 or 200, will require more light to make an exposure. Your camera will need more time to collect more light which will help you achieve the slow shutter speed you’re after.

Stop Down Your Aperture

Stop down your aperture as far as your can. To do this use a larger f-stop number, such as f/16, f/32, etc. This closes down the aperture, making a smaller opening that light will need to travel through, requiring more time for the camera to gather enough light to make the exposure. This lets you shoot using slower shutter speeds. Be aware, though, that the very smallest apertures can cause diffraction, which may reduce the sharpness of your photo. If this happens you’ll need to open up the aperture just a bit.

A wider aperture results in a faster shutter speed allowing you to see more detail in the water. ISO 200, aperture f/4, shutter speed 1/50 second.

A narrower aperture results in a slower shutter speed allowing you to blur the water. ISO 200, aperture f/11, shutter speed 1/8 second.

A wide aperture results in a faster shutter speed, freezing action and showing more detail in the water. ISO 320, aperture f/6.3, shutter speed 1/1250 second.

A small aperture results in a slower shutter speed, helping convey action by blurring the water. ISO 320, aperture f/25, shutter speed 1/60 second.

Use a Polarizing Filter

If everything above still isn’t enough to slow the shutter speed down enough to create the blur you’re after then you may need to resort to filters that fit over your lens. The first to try is a polarizing filter if you already have one.

A polarizing filter is often used to reduce reflections and glare on surfaces such as water and leaves, to create richer colors, and to darken skies. A side effect of these filters is reducing the amount of light that reaches the sensor, usually by about 1 to 2 stops. This isn’t a lot but it might be enough to get the shutter speed slow enough to blur the water.

Using a polarizing filter and a small aperture helped slow down the shutter speed, blurring the water from the fountains. ISO 200, aperture f/25, shutter speed 1.6 seconds.

Use a Neutral Density (ND) Filter

If nothing else will get the shutter speed slow enough you’ll want to invest in a neutral density filter. Think of this as sunglasses for your camera lens. It’s a dark filter that reduces the amount of light entering the lens. Neutral density filters are available in a range of levels, some reducing 1 stop of light, some 3 stops, some 5, 10 or even 15 stops of light. You can even find variable neutral density filters that let you turn the filter like a polarizer to change the density of the filter. With neutral density filters you’ll be able to slow the shutter speed down as much as you’d like.

You can also stack filters, using multiple neutral density filters to slow things down even more. And you can stack a polarizing filter and neutral density filters. Just be aware that if you stack too many filters you may begin to see the filters at the corners of the image. If this happens you either need to remove some of the filters or crop the image when you’re finished.

A polarizing filter in the middle of the day allowed a slow exposure, but not slow enough to really blur (or still) the moving water. ISO 200, aperture f/22, shutter speed 1/8 second.

A polarizing filter and a 5-stop neutral density filter in the middle of the day allowed a slow enough exposure to blur (or mostly still) the moving water. ISO 200, aperture f/22, shutter speed 4 seconds.

It's reasonably early in the morning without a filter. ISO 200, aperture f/11, shutter speed 1/80 second.

Adding a Singh-Ray Gold-N-Blue Polarizer and a 10-stop neutral density filter shifted the colors and slowed the shutter speed way down, introducing a lot of blur into the water. ISO 200, aperture f/11, shutter speed 67 seconds.

In this triptych I used a Singh-Ray Vari-N-Duo filter, which combines a polarizing filter with a variable neutral density filter, to gradually slow the shutter speed down by increasing the amount of neutral density. All images are ISO 200 with an aperture of f/25. The left image has a shutter speed of 1/8 second. The center image has a shutter speed of 4/5 second. The right image has a shutter speed of 8 seconds.

I hope these tips for blurring moving water have been useful to you. It can be a lot of fun and it can really add a nice dynamic to a photograph. So head out there and try a few of them out, see what kinds of interesting photographs you can create.

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Canal Falls by Todd Henson

Canal Falls

I was introduced to this scene by a friend many years back. It’s located along a canal and shows the falls between two levels. The key to this photograph was the long exposure, 15 seconds in this case. It allowed the water to blur, giving it that nice milky look as it goes over the rocks. It also lets the water at the bottom begin to swirl and flow into a circular pattern.

Ideally I would have liked more of the swirling water at the bottom, but on this day there was a lot of very slow moving foam just out of view that didn’t look very appealing, so I framed the image without it. Perhaps a slower shutter speed could have blurred the foam enough to include it, but I didn’t have a neutral density filter with me that day. I achieved the 15 second shutter speed by setting my ISO to the lowest setting (ISO 200) and closing down the aperture all the way (f/36). Thankfully it was an overcast day so I didn’t have to worry about harsh sunlight creating extreme contrast or blowing out the highlights in the water.

I’m thankful to my friend for showing me this peaceful and beautiful location that I might have otherwise overlooked.

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Angular Flow No. 2 by Todd Henson

Angular Flow No. 2

The Story

Angular Flow No. 2 is a photograph of water flowing over a dam above Great Falls on the Potomac River, between Maryland and Virginia. This photograph was created on the Virginia side of the river. A previous image, Angular Flow No. 1, was created on the Maryland side. As with the previous photograph, I had been photographing the falls and some of the various birds that congregate along the river.

At one point I ended up at the dam upriver from the falls. For the previous photograph I was standing upriver from the dam looking downriver. For this photograph I was standing just downriver from the dam looking upriver.

As before, I loved the patterns and tones created by the flowing water as it flowed over the dam. And I wanted to capture the interesting forms created by the churned up water below the dam, so I knew I needed a fast shutter speed.

The Technique

To get a fast shutter speed I just needed to open up the aperture of my lens, which lets in more light allowing the sensor to get a proper exposure in less time. As a side effect this also reduces the depth of field, but I chose such a small portion of the dam, and this was intended to be an abstract image, so the shallow depth of field wasn’t a great concern. You can see the water closest to and furthest from the camera is slightly out of focus due to the large aperture.

Using an aperture of f/5.6 and raising my ISO to 800 let me use a fast shutter speed of 1/2500 second, freezing the foaming water below the dam and letting us see some of the interesting patterns.

The Processing

Below is the raw image before I made any adjustments in Adobe Lightroom. It is a color image, but there isn’t much color and it didn’t contribute anything to the photograph so I knew I would convert to black and white.

The original raw image for Angular Flow No. 2

The exposure was a little darker than I would have preferred so I raised the exposure in Lightroom, lightening up the water. I also brightened the whites and darkened the blacks to add a little more contrast. And finally, I converted the image to black and white and adjusted each color channel to balance the tones. In this case there wasn’t much color in the image so I didn’t tweak much.

Angular Flow No. 2 - The final version in black and white

What do you think, would you have done anything differently? Let me know in the comments below.