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michabo

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Depth of field is the distance between the first and the last objects which are in focus.

A lens with a small depth of field (e.g.: a 200mm lens at f/1.8) might have a person's eye in focus but not their ears! A large depth of field (e.g.: a 10mm lens at f/29) might have a flower 30cm in front of the camera in focus, and also the mountains 30km away.

In general, the larger the focal length of the lens, the smaller the DoF, so from smallest to largest DoF you'd have: 200mm, 100mm, 50mm, 10mm. For any given lens, the smaller the focal ratio (f-number), the smaller the DoF, so f/29 is best for getting everything in focus, f/1.8 is good for focusing in on only one small portion of the subject.
 
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