In photography a shot can be captured in two or more different ways- this is due to depth of field. Depth of field is the effective focus range of the object in a scene/shot; this can be determined by the shutter speed and aperture. The depth of field in a photo can either be described as shallow or deep depending on the amount in focus in the shot.
A shallow depth of field means that the camera only focuses on a narrow part of the shot- this is the only thing that looks sharp in the photo. However, if the depth of field is described as deep then more of the picture comes into focus (sometimes this is the whole photo looking sharp.)
The depth of field ca be controlled by the aperture. The aperture of a camera can have ranges such as F2.8, F5.6, F8 and F16 just to name a few. If you wanted a shallow depth of field then you are most probably wanting a large aperture (this is F2 or F4.) This would mean that everything in front and behind the subject would be blurred out. Moreover, a deep depth of field would need a smaller aperture such as F16 and F22. As a result, the photograph will have the subject as the main focus but the background and front would come more into focus or sharper.
Another way in which depth of field can be controlled is through the actual focal length. The wider the angle of view the greater the depth of field becomes- if you were to use a telephoto lens then the sharpness of the photo instantly decreases. This means that any photos from a telephoto lens (so those of action photographers) most probably have a shallow depth of field. On the other had, a wide lens is probably most useful when taking landscape photos as it has a smaller aperture, and as a result gains a deeper depth of field; keeping everything in focus. The final thing that can effect the depth of field is how far the camera is from the subject. The closer you get to the subject you want to photograph, the limited depth of field you can get. This means that if you're close to your subject the more likely its surroundings will become blurry.Likewise, the further away your subject is, the deeper the depth of field- the more background comes into focus.
A photographer who uses Depth of field and aperture is Johnathan Thompson. The picture included is one of his food photography. In his blog, he describes the best ways for a picture to become pleasing for the viewer. For this picture i have chosen, he talks about how having an interesting background is good for these types of pictures despite them being blurred. This has a shallow depth of field, for a picture like this, it is good because it allows less of a clash between the background and the main subject being photographed.
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