18mm
24mm
35mm
55mm
Focal Length is not an actual length. It is the distance of the center of the lense to the point that is focus. If you "zoom in", it is like the camera is getting rid of the extra space and is focusing on a more direct point. The tighter you zoom, the more focused the photo will be on an object. If the camera is at 18mm, you will get more of a wide view than if the camera is set at 55mm.
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