For a thin lens in air, the focal length is the distance from the center of the lens to the principal foci (or focal points) of the lens. For a converging lens (for example a convex lens), the focal length is positive and is the distance at which a beam of collimated light will be focused to a single spot.

2023年9月18日 · Without getting into an in-depth physics discussion, the focal length of a lens is an optical property of the lens. The exact definition is: Focal length measures the distance, in millimeters, between the “nodal point” of the lens and the camera’s sensor.

The focal length of a lens defines the AFOV. For a given sensor size, the shorter the focal length, the wider the AFOV. Additionally, the shorter the focal length of the lens, the shorter the distance needed to obtain the same FOV compared to a longer focal length lens.

What Does the Focal Length of a Lens Mean? How focal length works is by describing each lens in terms of millimeters (lens mm). This description is a hard-physical reality of the lens in question, no matter the brand, format, or aperture.

Explore what is & how to use lens focal length (the optical distance from the point where the light meets inside the lens to the camera's sensor) with Adobe.

2023年5月13日 · Confused about focal length? Or cheat sheet quickly shows you how different lenses take in different parts of the scene

2024年4月26日 · This article explains the basics of focal length for photographic lenses. Focal length is an important figure that also relates to angle of view, depth of field and F-number (aperture value). Let’s understand what changes depending on the focal length and make the most of it when selecting lenses.

2024年2月2日 · The focal length of a lens is the optical distance from the point where the light meets inside the lens to the camera’s sensor. What difference does this make? Read our handy guide to be in the know

2024年10月18日 · Focal length is a fundamental photography concept in optics and camera lenses. It is the distance from the optical center of a lens (point of sharpest focus) to the camera sensor or film. It is measured when the lens is focused at infinity and is usually expressed in millimeters (mm). How Is Focal Length Measured?

Discover the perfect focal length for your photography style. We share the best focal lengths for landscapes, portraits, and more!