What Is Focus Stacking?

What is focus stacking? The technique explained!

Have you ever taken a photo where not everything was sharp, even though you had set the focus mode perfectly? This is because a camera’s depth of field is limited. Fortunately, there is a technique that solves this problem: focus stacking.

What is focus stacking?

Focus stacking is a photographic technique in which multiple shots with different focus points are combined into a single image with an increased depth of field. This process is mainly used in macro photography, product photography and landscape photography, where a limited depth of field would otherwise result in blurry parts of the image.

When taking a photo, depth of field depends on the aperture setting, focal length and distance to the subject. In many cases, it is not possible to capture the entire subject sharply in a single shot. Focus stacking solves this problem by taking a series of photos with shifting focus points and then digitally combining them. The result is a photo with sharpness that extends throughout the entire image.

When would you use focus stacking?

Focus stacking offers a solution for photographers who want their images to be tack-sharp from front to back. This is especially useful in the following situations:

What do you need for focus stacking?

For focus stacking, you need a camera and lens, a tripod, a remote control or timer, and software.

A camera with manual focus is ideal because it gives you complete control over the focus points. Both DSLR cameras and mirrorless cameras are suitable. A macro lens or a lens with a short minimum focusing distance is useful for macro photography, but this technique can also be applied with other lenses. Because you are taking multiple photos of exactly the same scene, a camera tripod is essential. This prevents movement between shots and ensures consistent images.

To minimise vibrations, you can use a remote control or set your camera’s self-timer. This prevents the camera from moving when the shutter is released. To combine the photos, you need specialised software. Popular options include Adobe Photoshop, which has a built-in focus stacking feature, Helicon Focus, and Zerene Stacker, which is widely used in macro photography.

How do you perform focus stacking?

Take a series of photos with shifting focus points

Gradually adjust the focus and take multiple shots, each time focusing slightly further into the image. This can be done manually or automatically with focus bracketing.

Practical tips for successful focus stacking

To make focus stacking a success, there are a number of practical tips that help achieve sharp and professional-looking results.

• Always ensure a stable setup. Even the smallest movement can cause blur, so use a sturdy tripod and avoid vibrations by using a remote control or your camera’s self-timer. Preferably work with manual focus so that you have complete control over the focus points and can accurately fine-tune each shot.
• Pay attention to the exposure and keep your settings consistent. Do not change the aperture, shutter speed or ISO while taking the series of photos, as this can create colour or brightness differences between the shots. If necessary, use additional lighting or a flash to maintain consistent exposure.
• Take enough shots with small focus shifts, especially in macro photography where the depth of field is very limited. Steps that are too large between focus points can result in blurry areas in the final image.
• Finally, careful post-processing is essential. Check that all layers are aligned

What are the advantages of focus stacking?

• Both the foreground and background are rendered tack-sharp.
• You decide which parts of the photo become sharp.
• You do not need to use an extremely small aperture, which helps prevent diffraction.

Frequently Asked Questions

Is focus stacking only suitable for macro photography?

No, although focus stacking is widely used in macro photography, the technique is also useful for landscape photography, product photography and architectural photography. Wherever a greater depth of field is desired, this technique can be a solution.

Can I apply focus stacking without a tripod?

In theory it is possible, but it is strongly discouraged. Without a tripod, there is a high chance of small movements between shots, which makes merging more difficult and can cause blur. A sturdy tripod ensures a stable composition and a better final result.

Which cameras have a built-in focus stacking or focus bracketing function?

Some modern cameras, such as certain models from Nikon, Canon, Sony and Olympus, have a focus bracketing function. With this, the camera automatically takes a series of photos with different focus points, making the process easier. Check your camera specifications to see whether this feature is available.

Can I also use focus stacking on my smartphone?

Yes, there are apps such as StackShot and Photoshop Express that allow you to perform focus stacking on a smartphone. The result is usually not as detailed as with a professional camera, but it can be an interesting way to try out the technique.