For an image to appear sharp and in focus, a photographer must first understand the depth of field in photography. Doesn’t matter if you’re a beginner or a professional, this blog will answer all your questions. So, let’s get started.
What is the depth of field in photography?
The depth of field in photography is the distance between the farthest and the nearest elements in a setting that appears to be “believably sharp” in an image.
The distance between the subject that is considered satisfactorily sharp and the camera is called the DoF in limit.
How is the depth of field measured?
The formula of the depth of field in photography is simple. DoF=2u2Nc divided by f2. Here, u= the distance of the subject, N= f-number, c= circle of confusion, f= focal length.
Thus, we can say that the depth of field can be calculated based on the distance to the subject, focal length, the acceptable circle of confusion size, and aperture.
What are the two types of depth of field?
The two types of depth of field in photography are shallow depth of field and deep depth of field.
The shallow or narrow depth of field in photography has a shorter depth of field to have a small amount of scene in focus. In this, the subject is often in focus and the background is blurred. The shallow depth of field is best for capturing the portraits.
The deep or wide depth of field in photography has a larger depth of field to have a large area of the scene in focus. This often keeps everything in the image very sharp and clear, thus nothing is blurred out. The deep depth of field is perfect for capturing landscapes, streets, and every photo where you want the whole scene to be clear and in focus.
What factors affect the depth of field?
The four important elements that affect the depth of field in photography are the distance of the camera to the subject, focal length, aperture, and the camera’s sensor size.
1. Distance between camera and the subject
The closer you keep your camera to the subject, the shallow will be the depth of field. Move your camera a little far from your subject to widen the depth of field and bring more items in focus.
2. Focal length
The focal length determines the magnification in an image. The narrow the image, the longer the focal length. Nad if the image is wider, the focal length gets shorter.
This enables you to capture a wide depth of field. The more the camera lens is zoomed, the less depth of field you get to capture.
This is the reason why portrait photographers love their amazing 70-200 mm focal length lenses to capture beautiful portraits. On the other hand, landscape photographers use wide-angle lenses to fit more in an image regardless of the distance.
Aperture is the easiest way to control the depth of the field in photography. The aperture controls the light in an image that passes through the lens and falls on the image sensor.
The larger hole allows more light to pass through making your images brighter. On the contrary, the smaller hole allows less light to pass making your images darker. Thus, you’ll be able to capture the less depth of field with a wider aperture and vice versa.
4. Sensor size
After taking all the other three factors into consideration, you’ll notice how the size of your camera sensor can affect the depth of field in photography. The bigger your sensor is, the shallower the depth of field will be.
This is also one of the reasons why landscape photographers use a crop sensor camera. When they need an overall sharpness and deep depth of field in photography, a smaller sensor can help fulfill this desire.
How do you create depth of field?
You can create the depth of field in photography once you fully understand that DoF is affected by the aperture, focal length, distance, and the sensor’s size.
Thus, to create a deep depth of field, you can either move away from your subject, increase your aperture, or shorten the focal length of your lens.
Or, you can try to balance all the factors until you get the frame you were looking for. To create a shallow depth of field in photography, simply do the opposite.
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