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Lens Mounts

Types

Embedded

Metric thread mounts exist for CCTV and Machine Vision applications. e.g. M4, M12, etc. (Ref: ISO Metric Screw Thread)

  • S or M12: No flange, BFD <1mm - 12 mm. f\1.6 or slower
    • Mechanical design for this mount type is not standardized. Each M12 is different.
  • CS: FFD 12.526 mm. f\1.0 range

DSLR Cameras

  • Lecia M
  • Fujjfilm X
  • Nikon Z
  • C Mount: FFD 17.526 mm

  • Micro Four Thirds: FFD 19.25 mm

  • Flange Focal Distance (FFD): distance from the mount point to the film/sensor. a.k.a Back Focal Distance (BFD), Flange-to-Film distance, Flange Focal Depth, Flange Back Distance (FBD), Flange Focal Length (FFL) or register

  • There are lens mount adapters to convert between mounts, but additional lenses should be added to compensate for the flange distance. Normally C mount lenses can be used with CS mount, but not vice-versa due to

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