How to use your C-mount lens on a Micro 4/3 camera body?

Micro 4/3 + C-mount lens

COMPATIBLE MF MA

Fortunately the M4/3 can handle the C-mount.

Although the flange focal depth of the Micro 4/3 is 19.25mm and the C-mount's is 17.526mm, there are recessed adapters that can make up for this difference, allowing to use infinity focus.

Find your adapter here:

There are also multi-adapters which can handle C-mount and M42 mount lenses both (M42 lenses get different flange focal distance but in this way you can adapt special helicoids):

C-mount lenses project a very small image, therefore you might have to anticipate a significant vignetting factor when using M4/3 lenses.

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Terminology

In terms of compatibility, we distinguish four separate categories:

COMPATIBLE

PARTIALLY COMPATIBLE

COMPATIBLE IN THEORY

NOT COMPATIBLE

This means that you'll be able to apply the lens on the camera in question with a proper adapter, and full focus range will be available with it (often with aperture control too). If AF is supported, you'll see it in the description.

This means that due to the flange focal depth or other factor this conversion would be normally unfeasible, but with some compromises (e.g. using a speedbooster adapter) can be made possible.

This means that the flange focal depth should make mounting and using inifinty focus possible, but for some reason there are no adapter rings available or other factors make it unviable.

This means that you won't be able to mount your lens due to mechanical incompatibility or the difference in flange focal depth doesn't make inifinity focus possible. Although numerous lenses can be mounted on cameras without infinity focus, but this cannot be considered actual compatibility.

Additional information for compatible variations:

MAC

manual focus (on the lens, with its own control ring)

autofocus available (AF controlled by the camera body)

manual aperture control (on the lens, with its own control ring)

automatic aperture control (controlled by the camera body)

speedbooster (focal reducer) adapters are available

macro (variable length) adapters are available

tilt-shift (or other flexible) adapters can be used

If you'd like to read more in-depth about compatiblity, you'll need to get familiar with flange focal depth, see this article.