Professional cameras let you attach different lenses. Each lens has a focul length. This is defined as the distance between the lens and the real image of an object in the far distance. A higher focal length indicates a greater image magnification.
Depending on the subject, a specific lens is recomended. If you want to take a picture of an object that is far away from you, you'll need a telephoto lens. This lens has an especially long focal length.
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| nikkor 70-300mm (telelens) |
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a subject with a telelens,
only a small part of the background is visible |
For objects near to you, let say portraits of people, you'll need a lens with a smaller focal length.
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| Nikkor 18-55mm (standard lens) |
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| the same subject, with a large background |
A standard 50mm camera lens is ideal for most situations. It doesn't significantly magnify or shrink the image, making it ideal for shooting objects that aren't especially close or far away.
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| Nikkor 50mm |
There are also lenses who try to combine both desired effects. These are of course more expensive.
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| Nikkor 18-200mm |
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