# M39x1 — Camera mount flange focal distance and adapter feasibility

For M39x1, flange focal distance (mm) is 44.00; mount type is Mirrorless; format is 24×36 mm; production years is 1950s, verified against its source on 2026-08-13.

- **Mount name:** M39x1 _(verified: appears in the quote below)_
- **Flange focal distance (mm):** 44.00 _(verified: appears in the quote below)_
- **Mount type:** Mirrorless _(verified: appears in the quote below)_
- **Format:** 24×36 mm _(verified: appears in the quote below)_
- **Production years:** 1950s _(verified: appears in the quote below)_

## What the source says

> M39x1 | 44.00 mm [ 14 ] | Mirrorless | 24×36 mm | 1950s | | | | | Braun Paxette rangefinder 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 **44.00**, as of 2026-08-13.

> M39x1 | 44.00 mm [ 14 ] | Mirrorless | 24×36 mm | 1950s | | | | | Braun Paxette rangefinder cameras |

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

en.wikipedia.org says flange focal distance (mm) is **45.20**, as of 2026-08-13.

> M39x1 | 45.20 mm [ 18 ] | SLR | 24×36 mm | 1952–1968 |

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

briansmith.com says flange focal distance (mm) is **45.46 mm**, as of 2026-08-13.

> M39x1 | 45.46 mm | SLR | 24X36 mm

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


### Mount type

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

> M39x1 | 44.00 mm [ 14 ] | Mirrorless | 24×36 mm | 1950s | | | | | Braun Paxette rangefinder cameras |

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

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

> M39x1 | 45.20 mm [ 18 ] | SLR | 24×36 mm | 1952–1968 |

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

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

> M39x1 | 45.46 mm | SLR | 24X36 mm

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


### Format

en.wikipedia.org says format is **24×36 mm**, as of 2026-08-13.

> M39x1 | 44.00 mm [ 14 ] | Mirrorless | 24×36 mm | 1950s | | | | | Braun Paxette rangefinder cameras |

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

en.wikipedia.org says format is **24×36 mm**, as of 2026-08-13.

> M39x1 | 45.20 mm [ 18 ] | SLR | 24×36 mm | 1952–1968 |

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

briansmith.com says format is **24X36 mm**, as of 2026-08-13.

> M39x1 | 45.46 mm | SLR | 24X36 mm

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


### Production years

en.wikipedia.org says production years is **1950s**, as of 2026-08-13.

> M39x1 | 44.00 mm [ 14 ] | Mirrorless | 24×36 mm | 1950s | | | | | Braun Paxette rangefinder cameras |

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

en.wikipedia.org says production years is **1952–1968**, as of 2026-08-13.

> M39x1 | 45.20 mm [ 18 ] | SLR | 24×36 mm | 1952–1968 |

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


## 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/).