Camera lens throat

{{Multiple issues| {{primary sources|date=May 2026}} {{refimprove|date=May 2026}} }} {{Short description|Inner diameter of a camera lens mount}}

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]].<ref name=PhotographyLife />

[[Canon Inc.|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."<ref>{{cite web |title=Camera Lens Mount Guide - Mount size |url=https://en.canon-me.com/get-inspired/tips-and-techniques/choosing-right-lens-mount/ |publisher=Canon |access-date=21 May 2026}}</ref>

In an [[interchangeable lens|interchangeable lens camera]], the combination of the throat diameter and the [[Flange focal distance|flange distance]] affect the [[Angle of incidence (optics)|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 [[Angénieux retrofocus|retrofocus]] designs for wider angle lenses.<ref name=PhotographyLife>{{cite web |last1=Mansurov |first1=Nasim |title=Camera Lens Mounts Explained - Mount Size, Flange Distance and the Angle of Incidence |url=https://photographylife.com/what-is-lens-mount#throat-size |access-date=21 May 2026 |date=13 November 2025}}</ref>

==See also== {{Portal|Photography }} * [[Camera]] * [[Geometrical optics]] * [[Lens adapter]]

==References== {{reflist}}

[[Category:Lens mounts]] [[Category:Photographic lens designs]]