Achieving focus at infinity is necessary to ascertain the precise focal length.

This measurement is taken from the point where converging light rays form a clear depiction of the subject to the digital sensor situated at the focal plane. Specifically, it quantifies the distance between the optical center of the lens and the central plane of the resulting image.

It gauges the lens's ability to magnify an image. The measurement of focal length is denoted in millimeters (mm). All lenses are named by their focal length and will help you guide your purchase process. For example, a smaller millimeter focal length will produce a wide angle of view, while a higher millimeter will produce a narrow view.Īsides the magnification, focal length also affects the field of view and the depth of the field.

It is essential when choosing a lens because it dramatically influences the image magnification and quality.

So you will know how it influences your photo and will be able to choose the right lens for you.Ī lens focal length is the distance from the lens to the film plane (digital sensor), expressed in millimeters. In this article we will try to give you the answers to what is lens focal length and what does it mean, what millimeters in focal distance means, and the focal range for different lens examples.

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