Camera lens throat

A lens throat is the inner diameter of a camera lens mount. It is the width of the opening, measured between two non-obstructed points, i.e., not including the mounting tabs on a bayonet mount.[1]

Canon stated, "Throat size is crucial for determining the angle of incidence and provides us with a more realistic picture of the mount's capabilities."[2]

In an interchangeable lens camera, the combination of the throat diameter and the flange distance affect the angle of incidence. A larger throat and a smaller flange distance make for a larger angle of incidence, allowing for more flexibility in lens design, without requiring retrofocus designs for wider angle lenses.[1]

The elements of a lens elements can have wider diameters with a larger throat diameter, meaning that surface curvature can be less drastic. And with a well-designed lens with lessened surface curvature you get less chromatic aberration.[3]

See also

References

  1. ^ a b Mansurov, Nasim (13 November 2025). "Camera Lens Mounts Explained - Mount Size, Flange Distance and the Angle of Incidence". Retrieved 21 May 2026.
  2. ^ "Camera Lens Mount Guide - Mount size". Canon. Retrieved 21 May 2026.
  3. ^ Dozier, Ed (14 November 2018). "Nikon Z Camera Lens Design Brilliance". Photo Art from Science. Retrieved 15 June 2026.
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