Panasonic Lumix DMC-FH20 Depth of Field Calculator
Preselected for the Panasonic Lumix DMC-FH20 (Small Sensor, circle of confusion 0.0051 mm).
What Is a Depth of Field (DoF) Calculator?
A Depth of Field Calculator is a helpful tool for photographers to see how much of their photo will appear in focus. By changing settings like aperture, focal length, and subject distance, you can control the zone of sharpness in front of and behind your subject.
Why Use It?
Photographers use a DoF Calculator to:
- Plan shots — Ensure the subject is sharp and decide how blurry the background or foreground should be.
- Save time — Quickly figure out the best camera settings before shooting, instead of trial and error.
- Learn photography — Understand how aperture, distance, and focal length work together to create artistic effects.
How Each Setting Impacts Depth of Field
Understanding the variables that go into a DoF calculation helps you take better control of your photos:
- Sensor Size: Larger sensors (like Full Frame) typically produce a shallower DoF at the same field of view compared to smaller sensors (like APS-C or Micro Four Thirds). This is because the acceptable circle of confusion (CoC) changes, altering how blur is perceived.
- Focal Length: Longer focal lengths (e.g., 200 mm) compress the background and tend to create a narrower zone of sharpness. Shorter focal lengths (like 24 mm) usually offer a deeper DoF.
- Aperture (f-number): A larger aperture (e.g., f/1.8) allows more light and creates a shallower DoF, blurring backgrounds for creative effects. A smaller aperture (e.g., f/16) yields a deeper DoF, keeping more of the scene in focus.
- Subject Distance: The closer you focus to your subject, the shallower your DoF. Increasing the distance between the camera and the subject generally increases the area that appears in focus.
Together, these factors help determine whether you want a softly blurred background (great for portraits) or a broad range of sharpness (ideal for landscapes). Adjust them in the calculator above to see how each change affects your overall Depth of Field!
Definitions
- Hyperfocal distance: The closest distance at which a lens can be focused while keeping objects at infinity acceptably sharp. It often maximizes overall sharpness in the scene.
- Hyperfocal near limit: When focusing at the hyperfocal distance, this is how close (in front of the camera) the sharp region starts.
- DoF Near Limit: The closest point in the scene that remains in acceptable focus for your chosen settings.
- DoF Far Limit: The farthest point in the scene that remains in acceptable focus.
- Depth of Field (Total): The entire distance between the near limit and the far limit—often called the “zone of sharpness.”
- Depth of Field in Front: How much distance in front of your subject is in sharp focus.
- Depth of Field Behind: How much distance behind your subject remains sharp.
Remember: Depth of Field is influenced by your camera’s sensor size, the lens’s focal length, the chosen aperture (f-number), and your subject distance. Experiment with different values in this calculator to see how each factor shapes the final photo’s sharpness.
Depth of Field Calculator FAQ
How do I calculate depth of field for my camera?
Pick your camera model (or its sensor size) in the calculator above, then enter the focal length, aperture and subject distance. It returns the near and far limits of sharp focus, the total depth of field, and the hyperfocal distance for that exact setup.
Does sensor size affect depth of field?
Yes. At the same field of view and aperture, a larger sensor such as full frame gives a shallower depth of field than a smaller APS-C or Micro Four Thirds sensor, because the acceptable circle of confusion changes. That is why this calculator asks for your camera or sensor first.
Why does a smaller sensor show less depth of field in this calculator?
Because the calculator uses the focal length you entered. At the same focal length a smaller sensor really does have less depth of field, since it is enlarged more to reach the same print size and the same blur becomes more visible. It also crops the framing, so it is not the same photo. The familiar rule that small sensors give more depth of field applies at the same field of view. At f/2.8 and 3 metres, full frame at 50mm gives about 0.58 m of depth of field, while a 1-inch camera framed the same way at 18mm gives about 1.69 m, roughly three times more.
What is hyperfocal distance?
The hyperfocal distance is the closest focus distance at which everything from half that distance out to infinity stays acceptably sharp. Focusing there maximises the depth of field in a scene, which is useful for landscapes.
How do I get a more blurred background?
For a shallower depth of field and more background blur, use a wider aperture (a smaller f-number such as f/1.8), a longer focal length, and move closer to your subject. The calculator shows how each change shrinks the zone of sharpness.
What aperture should I use for bird and wildlife photography?
With a long telephoto lens the depth of field is already very shallow, so many wildlife shooters stop down slightly, often around f/6.3 to f/8, to keep the whole bird sharp rather than just its eye. Enter your lens and subject distance above to see exactly how thin the focus zone is.
Why is depth of field so shallow with telephoto lenses?
Longer focal lengths render a narrower zone of sharpness at a given aperture and distance, so a 600mm lens on a distant subject can have only a few centimetres of depth of field. That is why nailing focus on the eye matters so much in wildlife work.