Nokishita has updated their information and included information on the mount. It does indeed appear that the RF mount is a shorter registration than the EF mount, and it requires an adapter to use EF lenses.
That is sure to please some that want to adapt lenses to the RF mount, and will disappoint others that were hoping for native EF compatibility as we surmised before.
From Nokishita;
M adapter R was confirmed with “Mount Adapter EF – EOS R”. Three types of mount adapters are available with control ring and drop-in filter.
The ability to use drop-in filters will certainly make this more than just your regular “dumb” adapter and add useful benefit to using EF lenses on an RF mount.
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I don't think it would be a problem. And it still sounds like a 'sexy solution' especially for video but also for stills.
NO ONE WANTS TO USE ADAPTERS.
Agreed. Sort of. This does leave open the possibility of adapting legacy lenses. I hope the adapter is not ridiculously expensive. I bought the OEM Canon EF to EF-M adapter on eBay for $40 when the whole world hated the original EOS M and stuff was cheap. Don’t see that happening again.
What do you mean, Sony EF lenses?
I personally preferred the native EF option, but a lot of people seem to manage fine with adaptors.
Sony best covers the 90% of niches remaining beyond those two lenses, and Nikon has nothing.
What is the difference between mounting a lens to a flange on a body and mounting it to a flange on an adapter? I haven’t noticed any difference myself.
I use the adapter for my EF lenses on my M3. I also use my 1.4x converter on my 200/2.8 and 400/5.6. Plus I use the EF extension tube and life size converter on various lenses. They are solid and work well. I have no qualms with an adapter for any new mirrorless. The key issue is the focusing protocol and mechanics. Most EF lenses are not optimised for focusing with mirrorless cameras. I expect that this will be the limitation, not the physical extension.
A smaller flange distance will give Canon more options in lens design.
I'm okay with that.
I guess the previous rumor of a 'clever' solution referred to the drop-in capability.