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Getting a moving subject in sharp focus can be a huge challenge for photographers and capturing moving especially fast moving objects involves more than just the focusing part. There are many other factors that need to be taken into account when trying to focus on fast moving subjects. Let us look at how to successfully focus on fast moving subjects.
It’s harder to hit a moving target than it is to hit a stationary target; any sniper, archer, or NFL quarterback knows this to be true. Photographers understand this challenge as well. One can’t possibly overstate the importance of nailing focus; focus works right alongside composition, framing, and lighting as factors that make for a good photo. Sure, there’s always some artistic wiggle room to account for, but if you fail to reach a certain threshold— perhaps an abstract one, perhaps an arbitrary one — your image simply isn’t going to go over too well with its intended audience.
In most situations, even when the lighting is changing, you have enough time to make necessary adjustments to get a good exposure. Similarly, composition changes only when you change it. And then there’s the issue of focus.
Focusing on static subjects is easy; if you run into problems, it could be due to some snafu with your lens and/or camera. But when your intended subject is on the move — and, even worse, moving rapidly — the difficulty level of the task at hand increases significantly.
So how do the pros focus on moving subjects? There’s no cookie cutter methodology, no one-size-fits-all approach. Different photographers use different ways to accomplish this. But when we look at the range of techniques used by various photographers, some very important, very helpful tips reveal themselves, and from those tips we can obtain a basic but highly functional understanding of how to better capture moving subjects.
Scenarios Where You Have Fast Moving Subjects:
Pets if they are running around
Children who are playing
Events – for example people dancing, etc.
Sports – usually all types of sports
Wildlife – birds in flight and animals that are on a hunt or fight
First, let’s work under the premise that everyone prefers autofocus (AF) to manual focus; in reality, this is far from a universal truth and there are a number of scenarios in which manual focus trumps autofocus, but we’ll get into that later. For now, AF is the name of the game. Modern camera come with autofocus systems that are incredibly fast and photographers need to make sure they use the correct autofocus methods for each scenario.
DSLRs are equipped with two general AF modes:
One mode for static subjects – Single shot AF
One mode for moving subjects – Continuous AF
Single Shot Autofocus:
Single shot AF works best for non-moving subjects such as portraits or landscapes and in situations where you need to focus and recompose. In single shot AF mode, you can’t take the photo unless focus is locked; the good part about this feature is that you can be rather certain your shot will be accurately focused.
The bad part is that if your once stationary subject starts to move after focus has been locked in, your shot will come out blurry because the camera will not adjust the focus again as long as you continue to press the shutter button. If you want the camera to refocus, you will need to lift the finger off the shutter release button and press it again to refocus. You’ll end up refocusing constantly, never being sure of when you’ll get the desired result.
So to conclude, single shot AF is great for stationary subjects but not a good choice for moving subjects. This is where continuous Autofocus comes into play.
Continuous Autofocus:
Enter continuous AF, the second of the two basic DSLR AF modes. As the name implies, the camera will continuously adjust focus as long as the shutter button is pressed halfway. It will keep this up right up to the point you release the shutter.
Since our focus here is on moving subjects, we need to be using the continuous AF mode to have the subject constantly in focus.
More on Continuous AF Mode:
Most people tend to use only one focus point (usually the center point). This works well enough for static subjects, but focusing on moving objects is a different story. Working in continuous AF mode, most newer DSLRs will allow you to choose one, a small cluster, or all of the camera’s focus points. Generally speaking, the more focus points you use, the greater chance you have of capturing rapidly or erratically moving subjects.
That doesn’t always mean that all the focus points should be selected, however. Having all the focus points active while trying to photograph a small subject or one that may become obscured by the background or foreground will confuse the camera and make it difficult to lock on to your intended target. You’ll probably get something in sharp focus, but it won’t be what you wanted.
Manually selecting a small cluster of focus points — or even a single focus point — will work better in some instances because the camera will focus only on the area of your choosing. All you have to do is track the subject with your camera. Zone autofocus or similar modes are great choices when shooting sports so you have an area of the subject in focus thereby allowing you to get sharper images with less room for error.
Different camera manufacturers employ their own naming conventions for these features, but they all essentially work the same way across brands; check your manual to find out not only what these features and modes are called on your camera, but also how to activate them.
Now along with the continuous autofocus mode if you also set the camera to continuous drive mode, you will be able to continuously focus on your subject and the same time shoot a series of images in succession. This combination is a great choice for shooting sports, wildlife and other fast moving subjects.
Continuous drive mode makes an excellent companion for continuous AF. Continuous drive mode allows you to take many shots in rapid succession, as fast as 12 frames per second depending on what camera you’re using. So, while you’ve got continuous AF active and paired with continuous drive, you simply need to track your subject and, when ready to shoot, hold the shutter button down. You will be rewarded with a series of images that show your subject in evolving stages of action.
If your camera’s AF system is up to the task, it will nail focus of moving subjects far more often than it fails. However, there are times when manual focus might work better. Many photographers use a technique known as pre-focusing.
Using this method, you pre-focus on a specific spot with one shot AF, then switch to manual focus to keep the focus at that distance locked in. Make sure you’ve got continuous drive mode active. Now let loose a burst of shots as the subject arrives at the point you focused on. This technique minimizes the amount of work the AF system has to do (time taken to autofocus, distance the lens barrel has to travel) and maximizes the odds that you get at least one in-focus shot.
Pre-focusing works especially well with predictable action, things like motor sports, where your camera’s AF system may not be able to keep up with the speed at which vehicles are racing toward them.
Set the AF mode to continuous focus. Canon refers to this as AI Servo, while Nikon calls it Continuous-servo AF.
Use continuous drive mode, sometimes called burst mode, most cameras should present you the option of high-speed and low-speed continuous shooting.
Activate the focus limiter. Some telephoto and macro lenses feature a focus limiter switch that limits the range of distances over which a lens will attempt to focus. If your lens has this feature, turn it on.
Turn on “type 2” image stabilization. While traditional image stabilization doesn’t assist in freezing action, some lenses are now equipped with a more modern secondary form of stabilization known as “panning mode.” This mode will stabilize movement only in the direction in which you are panning (moving horizontally) instead of trying to compensate for movement in all directions.
Use faster shutter speeds greater than at least 1/500th of a second or depending on the focal length used.
Use appropriate aperture values so that you have the subject in focus. Using very wide apertures can make your subject look soft or out of focus.
Under low light situations, use a flash to compensate for the light and shutter speed.
When necessary, increase the iso so that you do not have to compromise on the shutter speed.
And just to add one more entry to the palette of possibilities, there's back button focus. You can learn more about what it is, how it works, how to set it up on your camera here.
Even the best photographers will attest to the fact that successfully capturing moving subjects is a challenge, but it is not one that can’t be overcome with practice. Yes, it seems like a lot to juggle: not only do you have to pay attention to the lighting and make sure you create an interesting composition, but you’ve also got to go through all these steps to make sure your speedy subject is in sharp focus. Over time, though, it all becomes second nature. Before you know it you’ll be known as the fastest finger in town.
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