# C-mount — Camera mount flange focal distance and adapter feasibility For C-mount, flange focal distance (mm) is 17.526; mount type is cine / TV; format is 8 mm, 16 mm, 1/3", 1/2", 2/3", 1", 4/3"; production years is ~1926–, verified against its source on 2026-08-13. - **Mount name:** C-mount _(verified: appears in the quote below)_ - **Flange focal distance (mm):** 17.526 _(verified: appears in the quote below)_ - **Mount type:** cine / TV _(verified: appears in the quote below)_ - **Format:** 8 mm, 16 mm, 1/3", 1/2", 2/3", 1", 4/3" _(verified: appears in the quote below)_ - **Production years:** ~1926– _(verified: appears in the quote below)_ ## What the source says > C-mount | 17.526 mm [ 8 ] | cine / TV | 8 mm, 16 mm, 1/3", 1/2", 2/3", 1", 4/3" | ~1926– | ## 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 **17.526**, as of 2026-08-13. > C-mount | 17.526 mm [ 8 ] | cine / TV | 8 mm, 16 mm, 1/3", 1/2", 2/3", 1", 4/3" | ~1926– | Source: https://en.wikipedia.org/wiki/Flange_focal_distance briansmith.com says flange focal distance (mm) is **17.526 mm**, as of 2026-08-13. > C-mount | 17.526 mm | Cine/TV | Source: https://briansmith.com/flange-focal-distance-guide/ ### Mount type en.wikipedia.org says mount type is **cine / TV**, as of 2026-08-13. > C-mount | 17.526 mm [ 8 ] | cine / TV | 8 mm, 16 mm, 1/3", 1/2", 2/3", 1", 4/3" | ~1926– | Source: https://en.wikipedia.org/wiki/Flange_focal_distance briansmith.com says mount type is **Cine/TV**, as of 2026-08-13. > C-mount | 17.526 mm | Cine/TV | Source: https://briansmith.com/flange-focal-distance-guide/ ### Format en.wikipedia.org says format is **8 mm, 16 mm, 1/3", 1/2", 2/3", 1", 4/3"**, as of 2026-08-13. > C-mount | 17.526 mm [ 8 ] | cine / TV | 8 mm, 16 mm, 1/3", 1/2", 2/3", 1", 4/3" | ~1926– | Source: https://en.wikipedia.org/wiki/Flange_focal_distance briansmith.com says format is **8mm, 16mm, 1/3", 1/2", 2/3", 1", 4/3"**, as of 2026-08-13. > C-mount | 17.526 mm | Cine/TV | 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/).