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Canon EF body + Olympus OM lens


All clear, OM lenses have no issues with EF cameras.

The flange focal depth of the OM system is 46mm, which means that the adapter ring has to bridge a 2mm gap. The locking lever is situated on the housing of the lens, so it can be easily released from the adapter.

Find your adapter here:

Although the OM lenses have parts that hang over the bayonet lock, they don't interfere with the mirror even on most fullframe bodies.

This adapter type has chipped versions too, which provide digital focus confirmation for the camera. If you'd like to read more about the limitations of adapter chips, this article can help you.

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In terms of compatibility, we distinguish four separate categories:

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:

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.