EF / EF-S는 플랜지 는 같고

EF-M은 짧다?

Canon's EF-M has an 18mm flange focal distance, compared to 44mm for the EF and EF-S systems. 

[링크 : http://photo.stackexchange.com/questions/27254/whats-the-difference-between-canon-ef-s-and-ef-m]


The flange focal distance is 17.526 millimetres (0.6900 in) for a C mount.

CS-mount has a flange focal distance of 12.50 millimetres (0.492 in)

[링크 : https://en.wikipedia.org/wiki/C_mount]

Its large diameter and relatively short flange focal distance of 44.0 mm allows mechanical adaptation of EF camera bodies to many types of non-EF lenses.

[링크 : https://en.wikipedia.org/wiki/Canon_EF_lens_mount]

M42 lens mount Flange 45.5 mm

[링크 : https://en.wikipedia.org/wiki/M42_lens_mount]

마운트 종류 엄청 많네 -_-?

[링크 : https://en.wikipedia.org/wiki/Lens_mount#List_of_lens_mounts]

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