It is a Japanese word for a photo effect which is produced out of focus areas and beyond the depth of field. In a word, bokeh is a circle-like shape created by the shape of the aperture. You can shoot a bokeh using a wide aperture, such as f/2.8. You can also use a smaller aperture to create a bokeh if the background is distant enough. In doing so, we gain depth-of-field because the outcome is smaller circles of confusion. Now the f-number and the focal length are intertwined. The f-number is derived by dividing the focal length by the working diameter of the lens. Suppose you mount a 50mm and set the f-number to f/16. 1: Aperture Selection. The common wisdom is that your aperture affects your depth of field and it’s certainly the easiest to understand. Here is the simple rule. The larger your aperture, the less focal range you have in your photo. If you want a shallow depth of field, select a large aperture like f/2.8 or f/1.4. Depth of field covers the subject and an area slightly in front and behind the subject, so experiment with positioning the focal point. 5. Shoot and review the image to check that the depth of field is adequate. If not, use a smaller aperture, a shorter focal length lens, or move further away from the subject. Aperture is measured in terms of f-stops, also known as f-numbers. Like this: f/2.8, f/4, f/5.6, f/8, f/22, etc. As shown in the diagram below, the smaller the f-number, the larger the aperture hole: As the f-number increases, the aperture size decreases. Now, each full stop corresponds to a halving of aperture size. This is because Depth of Field is not just a function of aperture. Instead, aperture works together with a lens’s focal length, the amount of space between a camera and its subject, and the Circle of Confusion to create Depth of Field. This means to fully understand Depth of Field, a basic understanding of the way a lens works is required. A portrait photographer, for example, would typically use a wide aperture of f/1.8 or f/2 so that all the focus can be placed on their subject at the expense of details in the background. This is known as having a 'shallow' depth of field. Read more: Cheat sheet: Depth-of-field decisions Depth Effect is Turned Off. The last thing you can check is to make sure "Depth Effect" is turned on. The depth effect is automatically turned on if the wallpaper is compatible, but it doesn't hurt to check. Simply tap the three-dot menu icon in the bottom right and make sure it's toggled on. The first step to use shallow depth of field is to choose the right aperture. Selecting the correct aperture (f-stop) is the most important step when aiming for a shallow depth of field. A wider aperture such as f/1.4 or f/2.8 will allow you to capture that shallow depth of field look. How to work with depth of field: a step-by-step approach Step 1: Set your camera to Aperture Priority or Manual mode. Most cameras only offer two modes where you can easily Step 2: Determine whether you want a deep or narrow depth of field. Carefully observe your scene. Ask yourself: Do I Step t52M2Bg.