Landscape photographers often assume that stopping down the lens to f/16 or f/22 will produce the sharpest images. After all, a smaller aperture increases depth of field, which should make more of the scene appear in focus.
But there’s a hidden optical effect that starts working against you when apertures get too small: diffraction.
Diffraction is one of the most common reasons landscape photos look slightly soft—even when focus and shutter speed are correct.
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What Diffraction Actually Is
Diffraction is a physical property of light.
When light passes through a very small opening, like the aperture of a lens at f/16 or f/22, the light waves begin to spread and interfere with each other instead of traveling in perfectly straight lines.
Instead of focusing to a precise point on the sensor, the light spreads into a small pattern called an Airy disk. As the aperture gets smaller, these Airy disks become larger and begin overlapping.
The result:
fine detail becomes blurred at the pixel level.
This isn’t caused by your lens being bad, and it isn’t a focusing mistake. It’s simply a limitation of optics.
Even the sharpest lenses in the world are affected by diffraction.
Why f/22 Often Reduces Sharpness
At first glance, smaller apertures seem beneficial because they increase depth of field.
However, there is a tradeoff between depth of field and diffraction softness.
Here’s what typically happens as you stop down:
- f/2.8 – f/4: shallow depth of field
- f/5.6 – f/8: peak optical sharpness for many lenses
- f/11: still very sharp with increased depth of field
- f/16: diffraction begins softening fine detail
- f/22: noticeable softness across the frame
At f/22, the diffraction blur often outweighs the benefit of additional depth of field. This means that even though more of the scene appears “in focus,” the entire image becomes slightly softer.
Modern high-resolution sensors make this even more noticeable because they capture extremely fine detail.
Many landscape photographers unknowingly lose sharpness simply by assuming that smaller apertures are always better.

The Balance Landscape Photographers Need
The goal is to find the optimal aperture where you gain enough depth of field without introducing too much diffraction.
For most lenses and modern cameras, that sweet spot usually falls between:
f/8 and f/11
But landscapes are rarely simple. Scenes often include:
- rocks close to the camera
- distant mountains
- trees across varying distances
This is where truly sharp landscape photography becomes more advanced.
Simply stopping down to f/22 isn’t the solution.
Mastering Sharpness in Real Landscape Scenes
Professional landscape photographers typically combine several techniques to maintain maximum sharpness:
• choosing the optimal aperture for the lens
• positioning focus carefully in the scene
• using hyperfocal distance when appropriate
• combining multiple focus points when necessary
This is where landscape photography becomes much more technical than many photographers realize.
Want to Learn the Complete Landscape Sharpness Method?
Understanding diffraction is just the first step.
Inside the PictureCorrect Premium newsletter (only $1 to try this weekend), subscribers learn the complete workflow for maximizing landscape sharpness, including:
• How to calculate the optimal aperture for your camera and lens
• Focus stacking techniques that allow you to avoid diffraction entirely
• A field-tested landscape sharpness method used by experienced photographers
Whether you’re working to master manual control, or advanced photo editing techniques, Premium gives you the structure to make steady progress. The special $1 intro offer is wrapping up this evening, and once it’s gone, so is your chance to lock in early access.
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