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Is it possible to reverse-mount a mirrorless lens on a DSLR

Started 10 months ago | Questions thread
philzucker
philzucker Forum Pro • Posts: 10,390
Re: Is it possible to reverse-mount a mirrorless lens on a DSLR

Jethro B-UK wrote:

Obviously a lens designed for a CSC won't work (or mount) on a DSLR, but I'm wondering:

Would a mirrorless lens (canon EF-M) mount on a DSLR (canon EF-S) when reversed?

Thanks

I'm not familiar with EF-M mount lenses, but I think it has - as most modern mounts - no mechanically controlled aperture, so the problem in reverse mounting is not the mechanical coupling (no problem here using the right adapter), but control of the aperture.

There are ways for EF-S and Sony E-mount lenses to unmount them with a specified aperture (e.g. IIRC for Sony lenses you must unmount the lens with the desired setting active while the body is still powered on) - I'm not sure if EF-M lenses can be handled comparably. So if you find a way and you can live with a fixed aperture this can work.

It's easier though to reverse mount an older lens with mechanically controlled aperture and dedicated aperture ring. Doesn't matter which mount, then.

Phil

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