# Camera lens throat

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Camera_lens_throat
> Markdown URL: https://mediated.wiki/source/Camera_lens_throat.md
> Source: https://en.wikipedia.org/wiki/Camera_lens_throat
> Source revision: 1356306972
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article relies excessively on references to primary sources. Please improve this article by adding secondary or tertiary sources. Find sources: "Camera lens throat" – news · newspapers · books · scholar · JSTOR (May 2026) (Learn how and when to remove this message) This article needs more citations. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Camera lens throat" – news · newspapers · books · scholar · JSTOR (May 2026) (Learn how and when to remove this message) (Learn how and when to remove this message)

Inner diameter of a camera lens mount

A **lens throat** is the inner [diameter](/source/Diameter) of a camera [lens mount](/source/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](/source/Bayonet_mount).[1]

[Canon](/source/Canon_Inc.) 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](/source/Interchangeable_lens), the combination of the throat diameter and the [flange distance](/source/Flange_focal_distance) affect the [angle of incidence](/source/Angle_of_incidence_(optics)). 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](/source/Ang%C3%A9nieux_retrofocus) designs for wider angle lenses.[1]

## See also

- [Photography portal](https://en.wikipedia.org/wiki/Portal:Photography)

- [Camera](/source/Camera)

- [Geometrical optics](/source/Geometrical_optics)

- [Lens adapter](/source/Lens_adapter)

## References

1. ^ [***a***](#cite_ref-PhotographyLife_1-0) [***b***](#cite_ref-PhotographyLife_1-1) Mansurov, Nasim (13 November 2025). ["Camera Lens Mounts Explained - Mount Size, Flange Distance and the Angle of Incidence"](https://photographylife.com/what-is-lens-mount#throat-size). Retrieved 21 May 2026.

1. **[^](#cite_ref-2)** ["Camera Lens Mount Guide - Mount size"](https://en.canon-me.com/get-inspired/tips-and-techniques/choosing-right-lens-mount/). Canon. Retrieved 21 May 2026.

---
Adapted from the Wikipedia article [Camera lens throat](https://en.wikipedia.org/wiki/Camera_lens_throat) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Camera_lens_throat?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.