From the course: Canon 5D Mark III Essential Training

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Using the depth of field preview button

Using the depth of field preview button - 5D Tutorial

From the course: Canon 5D Mark III Essential Training

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Using the depth of field preview button

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Just like your eye, your camera's lens has an aperture in it that can open and close to let in more or less light. When the aperture is more open, you get shallower depth of field; when it's more closed, you get deeper depth of field. This is all explained in detail in Foundations of Photography: Exposure. Obviously, as the aperture closes, less light gets into the camera. So by default, the camera always leaves its aperture wide open, so that when you look through the viewfinder, you see a nice bright image. Even if you have dialed in a very small aperture for shooting, when you look through the viewfinder, you're still looking through a wide open aperture, to ensure that you can see your scene clearly. When you finally press the shutter button, the camera closes it's iris down to your chosen aperture setting. Because the aperture in your camera is always wide open when you're looking through it, you are not necessarily seeing the true depth of field that you will see in your final…

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