Focal length is how zoomed in you are on you picture before you take it. A zoom lens is a lens like the one I used here where I can change how zoomed in I am. A focal lens is a lens where you only have some setting of zoom, for example you can only see a 55mm zoom and that's all that's possible. Now the focal lens probably sounds like a dumb idea because why wouldn't you want options?! But with the focal lenses are smaller, faster and take better quality pictures.
18mm:
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