# Mamiya RB — Camera mount flange focal distance and adapter feasibility

For Mamiya RB, flange focal distance (mm) is 112.00 mm; mount type is SLR; format is 6×7 cm; production years is 1970–, verified against its source on 2026-08-13.

- **Mount name:** Mamiya RB _(verified: appears in the quote below)_
- **Flange focal distance (mm):** 112.00 mm _(verified: appears in the quote below)_
- **Mount type:** SLR _(verified: appears in the quote below)_
- **Format:** 6×7 cm _(verified: appears in the quote below)_
- **Production years:** 1970– _(verified: appears in the quote below)_
- **Throat diameter (mm):** 60 _(per graphics.cornell.edu, not stated by the source above)_

## What the source says

> Mamiya RB | 112.00 mm | SLR | 6×7 cm | 1970–

## 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 **112.00 mm**, as of 2026-08-13.

> Mamiya RB | 112.00 mm | SLR | 6×7 cm | 1970–

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

graphics.cornell.edu says flange focal distance (mm) is **112**, as of 2026-08-13.

> Mamiya RB | bayonet | 112 | 60 |

Source: https://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html


### Mount type

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

> Mamiya RB | 112.00 mm | SLR | 6×7 cm | 1970–

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

graphics.cornell.edu says mount type is **bayonet**, as of 2026-08-13.

> Mamiya RB | bayonet | 112 | 60 |

Source: https://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html


## Source

- https://en.wikipedia.org/wiki/Flange_focal_distance
- https://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html

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/).