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this is the number of millimeters a lens will make a sharp image at, usually from its back element. 50mm is usual on 35mm film cameras-i.e.as your eye sees a subject. Digital is different for each camera.

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13y ago
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13y ago

It means the focal length of the lens is infinitely adjustable from 75 to 300 millimeters.

And the focal length is important as it represents the field of view. A wide angle lens might have a 90 degree field of view which is wider than the average human eye and might help create an artistic effect. Or show more of an interior room. A narrow field of view, like the 300mm setting of the lens described above, has the same affect as a telescope by magnifying distant objects.

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Q: What does 75-300mm mean?
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