What is the Depth of Field Preview Button?
The depth of field preview button is used to view what your focus depth will look like in the final photo, if using anything other than the lowest number (widest aperture iris). When you are setting up a shot and view the scene through your viewfinder or LCD screen, your camera will keep the aperture open to it’s widest setting in order to let as much light in as possible, helping you focus and compose your shot. It’s only when you press the shutter release that it closes down to the aperture you have set.
Example, if you are photographing a landscape which requires a higher aperture number (smaller aperture iris), say f16, then you can use the preview button to temporarily close down the aperture from it’s widest to f16 to see what the results will be like.
The preview will make the preview look slightly darker as the iris closes down.
Where is the button?
Usually somewhere around the lens base (where the lens fixes to the camera body). You can see it’s just to the left of the lens on the camera below. Not all cameras have a preview button.
What does it look like?
Usually a small plain button.
How to Use it?
Simply point your camera in the direction of your subject, look through the viewfinder, or at the screen if you are in live view, and press the button as you look. It won’t affect anything to do with the photograph, it’s simply a preview, therefore you can press the button on and off to see the difference it makes to the image.
YOU MAY ALSO LIKE…