Camera lens throat
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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][2]
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."[3]
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 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.[4] The larger throat more easily allows lenses which reduce the corner shading while being less complex in design.[5]
See also
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References
[edit]- 1 2 Mansurov, Nasim (13 November 2025). "Camera Lens Mounts Explained - Mount Size, Flange Distance and the Angle of Incidence". Retrieved 21 May 2026.
- ↑ Kilpatrick, David (19 August 2012). "Should NEX go full frame?". Cameracraft. Retrieved 11 October 2026.
- ↑ "Camera Lens Mount Guide - Mount size". Canon. Retrieved 21 May 2026.
- ↑ Dozier, Ed (14 November 2018). "Nikon Z Camera Lens Design Brilliance". Photo Art from Science. Retrieved 15 June 2026.
- ↑ Brown, William (2 September 2018). "Nikon Z7 – the new Mirrorless camera". Will's Photoimaging. Retrieved 11 October 2026.