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This can be difficult to achieve in-camera because if you’re shooting up-close, you can’t always get a lot of your subject in focus.
Stopping down to a smaller aperture (higher F-stop number) will not necessarily help you get a sharper image.
Enter Photoshop and focus stacking.
Focus stacking is a post-production technique of blending several images with different focus points to create one image that is sharp and in focus throughout the entire subject.
It’s the ultimate way to get the sharpest images, and it’s a crucial technique to know for still life photography.
Your aperture, focal length and the distance from your subject all impact the sharpness of your image.
Shooting at a higher F-stop number like f/22 won’t help you get sharper images in still life photography because of lens diffraction.
When you shoot at f/2.8 or f/4, a lot of light hits your camera sensor directly. At apertures like f/16, the light hits the subject less precisely and causes a loss of sharpness.
It doesn’t matter how good your lens is – your images will be less sharp at apertures of f/16 and higher due to this law of physics.
The more you stop down, the finer details will blur out further.
Lens diffraction tends to be worse in zoom lenses than prime lenses because zooms have several moving parts.
In still life and product photography, you often need to get pretty close to your subject. This means a shallower depth-of-field.
If you’re shooting small objects like jewelry, or objects that need to fill the frame, you’re usually so close that its entire depth cannot be in focus.
Using a macro lens like a 100mm or 110mm will also give you a shallow depth-of-field.
This is great if you’re doing food photography and want that blurred out background that is sought after in that genre, but for other types of still life, it creates a problem.
In order to focus stack in Photoshop, you need to shoot in a certain way with certain tools.
First of all, you need a sturdy tripod because your subject must be in exactly the same position from shot to shot in order to be successfully blended later in Photoshop.
If you accidentally bump your tripod, you’ll need to start all over again.
A shutter release is recommended to activate the shutter. Pressing the shutter by hand will introduce a small vibration that can introduce camera shake into the image and cause them to be misaligned in Photoshop.
That being said, Photoshop does a good job with aligning layers that are slightly off.
To shoot for focus stacking, start off by composing your shots and determining your exposure. You should use manual mode so that your exposure is the same from shot to shot.
Three images will often be enough to cover each area of depth-of-field but it will vary by image
To blend the images together in Photoshop, start off by exporting PSD files into a folder or onto your desktop where you can easily find them.
If you have uploaded a lot of images, flatten the final image by selecting Layer -> Flatten Image -> Save.
Focus stacking is necessary for product photography but also very useful for other types of still life photography – even food photography.
If you’re fairly new to Photoshop, don’t be intimidated.
Focus stacking is a lot easier than you might think and you will undoubtedly be pleased with your results.
Have you used photoshop focus stacking? If so, share with us your thoughts and images below.