Focus stacking is one of the most important intermediate photography skills that you can learn.
It will increase your creativity in the field and allow you to create more depth in your images. It is a fairly simple technique, but it does require the use of post-processing applications.
Focus stacking for landscape photography was adopted from macro photographers, who first experimented with the technique. It allowed them to overcome the focus limitations of their camera and create small scene images where they could control what was in focus (ex. a flower or insect). Landscape photographers use the technique in a similar fashion. There are certain scenes and compositions where it is optically impossible for a camera to take a single shot where everything is in focus. A basic example is wildflowers in the foreground with mountains in the background. This is actually the situation where I use focus stacking the most.
Envision your camera just inches away from foreground flowers, at that point, you have to make a choice. Do you want the flowers in focus and have the mountains totally blurred, or do you want the mountains in focus and the flowers blurred? Focus stacking enables the photographer to choose both. Let’s dive a little deeper into the method and then go through an example.
What Is Focus Stacking?
Focus stacking is a technique that allows you to maximize depth of field and ensure overall image sharpness. It involves capturing two or more images with different focal points and merging those images together using a post-processing application (I use Adobe Photoshop CC). The merging and blending process uses only the sharpest/in-focus areas of each respective image. The final result is a single image that is tack sharp from foreground to background. It is similar to exposure blending, but in this case, images with different focal points are merged versus different exposures.
Why Should You Focus Stack?
The two main benefits are increased depth in your image and complete sharpness. Without a doubt, the ability to focus stack increases the number of creative compositions available to you in a particular scene as well. It allows you to place your lens just inches away from an element and still be able to produce a shot that is sharp from front to back. This leads to more potential framing opportunities and more interesting foregrounds. If you think about it, you have more foregrounds available to you if you use this technique; you just need to think smaller. A wide-angle lens placed inches away from a small object will actually make that object look very prominent, making it a possible foreground element in your composition. Using the technique has undoubtedly increased my own creativity.
The other big benefit is the ability to ensure maximum sharpness. Yes, you can find your hyperfocal distance for a scene and shoot at narrow apertures like f/22, but hyperfocal distances take time to learn and narrow apertures detract from your image quality. Hence, with focus stacking, you can fire off two to three frames and if your initial frame is lacking sharpness in the foreground, mid-ground, or background, you can blend an additional exposure with a different focal point to compensate (ultimately creating a final image that is completely sharp).
When Should You Focus Stack?
Focus stacking is oftentimes not necessary, but it is almost always an option. It is a technique you should employ in specific scenarios:
The above scenarios are when I like to focus stack. I use it the most when using my wide-angle lens and photographing subjects that are very far apart from each other. I have friends who use the technique exclusively just to ensure they have the best sharpness possible for large scale prints.
How Do You Focus Stack?
Focus stacking requires some pre-meditation and vision, as you must capture the required exposures in the field to later merge them together while post-processing. I will share my basic workflow for focus stacking, and from there, it is up to you to practice and experiment to figure out a focus stack workflow that works best for you.
In-Field Considerations
In the Digital Darkroom
Here’s an example I have put together to show how to merge and blend focus stack exposures in post-processing. I use Adobe Lightroom CC and Adobe Photoshop CC. I believe there are other applications that are capable of focus stacking, but I prefer the Adobe suite.
Below are a group of exposures that I took of the Tatoosh Range of Mount Rainier National Park. I was using a Nikon D800e, a Nikkor 14-24mm f/2.8, and my lens was very close to the foreground flowers. Thus, to ensure the entire scene would be sharp, I needed to focus stack. It was not windy so I was not concerned with my shutter speed and I shot at aperture f/16. I took four exposures that covered the focal plane of the scene.
Steps
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