# M42×1 — Camera mount flange focal distance and adapter feasibility

For M42×1, flange focal distance (mm) is 45.46 mm; mount type is SLR; format is 24×36 mm; production years is 1949–, verified against its source on 2026-08-13.

- **Mount name:** M42×1 _(verified: appears in the quote below)_
- **Flange focal distance (mm):** 45.46 mm _(verified: appears in the quote below)_
- **Mount type:** SLR _(verified: appears in the quote below)_
- **Format:** 24×36 mm _(verified: appears in the quote below)_
- **Production years:** 1949– _(verified: appears in the quote below)_

## What the source says

> M42×1 | 45.46 mm | SLR | 24×36 mm | 1949–

## Source

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

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/).