Sony E-mount: 18 mm flange focal distance — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/sony-e-mount/  (sheet CC BY 4.0)
Basis: Published numbers only (sources per row); no bayonet geometry is published, so no file
Catalog version: 2026-10-20

Sizes: see table below
- Flange focal distance is the distance from the mount's reference face to the image plane; adapters and extension tubes must add exactly the difference between two mounts' flange distances to keep infinity focus.
- No file: the bayonet's lug widths, angles, depths and locking geometry are not published by the maker, so nothing is drawn. Only the published numbers are given.

parameter  value  from
flange focal distance  18.00 mm  Flange focal distance table; XDCAM-User
throat / inner diameter  not published by the maker in a source I could verify (left out)  —
coupling  bayonet  —
formats  full frame (FE) and APS-C (E) lenses share the mount  —

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Flange focal distance (table of mounts) — web — CC BY-SA 4.0 (text); dimensions are facts — https://en.wikipedia.org/wiki/Flange_focal_distance
- XDCAM-User (Alister Chapman): The E in E-mount stands for eighteen (18 mm flange back) — web — Publisher's page; dimensions are facts — https://www.xdcam-user.com/2019/11/27/the-e-in-e-mount-stands-for-eighteen/

No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.
API: https://xemstudio.com/api/geometry?object=sony-e-mount