ANGLINGIRELAND

tack4

Depth-of-field refers to the amount of the scene that appears to be sharp in your shot. Unlike our eyesight, which compensates for limited depth-of-field by quickly scanning different areas of the scene and focusing on near and distant points, camera lenses must obey some simple physical laws. Chiefly, depth-of-field extends in front of and behind the point you’ve focused the lens on. This zone of sharpness is not distributed evenly, however: it extends twice as far behind the focus point as it does in front of it.

The amount of depth-of-field in your shot is determined by three factors – the focal length of the lens, the aperture used and the distance from the subject.

1. Focal length. The shorter the focal length of the lens the greater the depth-of-field, and the longer the focal length, the smaller it will be. In general, using wide-angle lenses you’ll find that most of the scene is in sharp focus, while telephoto lenses are better for giving shallow depth-of-field, allowing you to throw distracting background elements out of focus, beyond depth-of-field.

2. Aperture. The wider the aperture you use the less depth-of-field you’ll get. So, using a wide aperture of f/4 or f/2.8 will mean that less of the scene will be in sharp focus than if you use a small aperture, such as f/16 or f/22.

3. Distance. The closer you are to the subject the less depth-of-field you’ll have to work with. You’ll find it easier to get greater depth-of-field if you focus on subjects further away from the camera. Conversely, if you want shallow depth-of-field, move closer. This is most apparent when shooting close-ups, where you’ll get very shallow depth-of-field.

for example smaller appeture on landscape shot f/22
produced

wider apeture f/5.4

produced this with more burry background

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FIREY BROWN · Joined: 17 Nov 2007 Posts: 582 Location: belfast

OK here goes,,so does that mean to say that if you want to take a pic of that bug you could stand FURTHER back from it BUT take it at F2.8 then the backround would be not in focus and the BUG would be more in focus thus giving you the fuzzy backround and a clearer photo of the BUG ??

Regards
FIREY BROWN
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tack4 · Posted: Sat Jan 12, 2008 8:57 pm Post subject:

correct m8

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