How long this area of acceptable focus is (or how deep, meaning area from front to back) is your DoF or Depth of Field.Īs you increase your aperture number (close down to a smaller opening, or a larger number), say go from f/2.8 to f/4 or from f/4 to f/5.6, the invisible area in front and behind the plane of focus will get larger. When you focus your camera on a subject, your camera will establish a plane of focus - basically an imaginary plane is set and the things on that plane are “in focus” (more specifically they are at the point of critical focus). I put that in quotes because around the plane of focus (in front and behind) there is still an area of acceptable focus. Before we look at those other variables that affect depth of field, let's establish what depth of field is. But there are times when what you think should be happening doesn't, and also there are times where you may not have the option to shoot at f/1.4 and still want a shallow depth of field. The foreground subject should be blurry.First things first, aperture does affect depth of field and in a normal shooting scenario aperture is your first consideration (if not only for most) when considering your depth of field. Use manual focus so that ONLY the subject in the BACKGROUND is in focus. SHOT 3: Use a large aperture (small f-stop #) to create a shallow depth of field.Use manual focus so that ONLY the subject in the FOREGROUND is in focus. SHOT 2: Use a large aperture (small f-stop #) to create a shallow depth of field.BOTH of your subjects should be in focus. SHOT 1: Use a small aperture (large f-stop #) to create a large depth of field.Use a tripod and do not move your camera in between shots. You will take 3 photographs of your subjects. Just make sure that you can see both the foreground and background subjects at the same time. It can be two objects, two people or even one object or person that has a part of them/it closer to the camera and part farther back in space (for example, a person holding their hands out towards the camera to frame their face). Set up a shot so that you have a subject in the foreground (close to you) and in the background (farther back). Depth of Field (the area of your photo that is in focus) Exposure (how much light is let in to your camera) A wide aperture (smaller f-stop number) will keep only a certain area of your photo in focus, leaving elements outside of that area blurry. A small aperture (larger f-stop number) will keep most if not all of your image in clear focus. Shutter speed also controls your "depth of field" or the area of your photo that is in focus. Smaller f-stop numbers (like f/2.8) designate a wider aperture. The size of the aperture is referred to as an "f-stop." Larger f-stop numbers (like f/22) designate a smaller aperture. When you are outside in the bright sun, your pupils get smaller, to block some of that light out! When its dark out, your pupils open very wide to let more light in to help you see better. Smaller aperture= less light, Larger aperture= more light! The size of the hole can be changed to control how much light is let into the camera. Aperture is the hole through which light enters the camera.
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