# D-mount — Camera mount flange focal distance and adapter feasibility

For D-mount, flange focal distance (mm) is 12.29; mount type is cine; format is 8 mm, verified against its source on 2026-08-13.

- **Mount name:** D-mount _(verified: appears in the quote below)_
- **Flange focal distance (mm):** 12.29 _(verified: appears in the quote below)_
- **Mount type:** cine _(verified: appears in the quote below)_
- **Format:** 8 mm _(verified: appears in the quote below)_

## What the source says

> D-mount | 12.29 mm | cine | 8 mm | | | | | | (8 mm movie cameras) |

## Sources disagree

More than one authority states this, and they do not state the same
thing. Both are reproduced with the source each came from.

### Flange focal distance (mm)

en.wikipedia.org says flange focal distance (mm) is **12.29**, as of 2026-08-13.

> D-mount | 12.29 mm | cine | 8 mm | | | | | | (8 mm movie cameras) |

Source: https://en.wikipedia.org/wiki/Flange_focal_distance

briansmith.com says flange focal distance (mm) is **12.29 mm**, as of 2026-08-13.

> D-mount | 12.29 mm | Cine | 8mm

Source: https://briansmith.com/flange-focal-distance-guide/


### Mount type

en.wikipedia.org says mount type is **cine**, as of 2026-08-13.

> D-mount | 12.29 mm | cine | 8 mm | | | | | | (8 mm movie cameras) |

Source: https://en.wikipedia.org/wiki/Flange_focal_distance

briansmith.com says mount type is **Cine**, as of 2026-08-13.

> D-mount | 12.29 mm | Cine | 8mm

Source: https://briansmith.com/flange-focal-distance-guide/


### Format

en.wikipedia.org says format is **8 mm**, as of 2026-08-13.

> D-mount | 12.29 mm | cine | 8 mm | | | | | | (8 mm movie cameras) |

Source: https://en.wikipedia.org/wiki/Flange_focal_distance

briansmith.com says format is **8mm**, as of 2026-08-13.

> D-mount | 12.29 mm | Cine | 8mm

Source: https://briansmith.com/flange-focal-distance-guide/


## Source

- https://en.wikipedia.org/wiki/Flange_focal_distance
- https://briansmith.com/flange-focal-distance-guide/

Last verified: 2026-08-13. Review by: 2028-08-12.
Part of [Camera mount flange focal distance and adapter feasibility](https://referencesource.org/camera-lens-body-adapter-compatibility/).