One question about mounts and M and R series:
There is an adapter to fit EF lenses to M bodies. There is an adapter to fit EF lenses to R bodies. Is it technically possible for an adapter to fit R-series lens to M bodies?
I appreciate using R series lenses on M bodies might less than ideal (R diameters being significantly larger) but same or worse would presumably apply to EF lenses on an M body with the available adapter.
(I only have a Canon APS-C DSLR so I' ready to upgrade but have no experience of the R nor M series bodies nor lenses)
Ian
I'll elaborate on koenkooi's reply. The EF-M and RF lenses sit at very similar distances from the focal plane, but both are quite different from the EF distance to the focal plane. So the EF -> M adapter and EF -> R adapters can (optically) be empty tubes that just space the lens, so that the EF lens sits as far away from the sensor as it would on an EF camera.
But the difference between EF-M and RF is two milimeters, and one can't construct a tube that short and have the flanges on it, the flanges would interfere with each other.
One *could* create an adapter (in either direction, though I imagine R->M would be more desirable) that used optics to alter the necessary difference, but as far as I know, no one has done this or even begun to do it.