Will Canon's FF Mirrorless be EF or EF-M Mount?

The Fat Fish wrote:

Hi all,

A couple of months ago I asked what mount you wanted for Canon's upcoming professional full frame mirrorless camera. The majority voted for EF although it was close. What I want now want to know is what you now think it will be, not what you want it to be.

So, what mount do you THINK it will be?

It will have to be EF-M. Because if it will remain EF/EF-s:

- It will not get the best in performance of MILCs

- Up to a point, and especially with APS-C, there is indeed a size and weight advantage

- Many of existing EF lenses also need to a retrofit anyway. To be able to do video effectively, the new nano USM AF needs to be put in the new EF-M lenses. It combines the best of old style USM and STM. The new nano seems faster and quieter too. It hits the spot for fast AF and quiet AFing both in video and photo.

- With the exceptional performances of the Sony, Fuji lenses, particularly Sony, there really is a need to re-do many Canon lenses. The 24-105 f4L, the 12-24, and 16-35 are just a few that needs a retrofit. Removing that space in old lenses will help improve optical performance in some focal lengths which were very hard to get right in the past.

- To not go true mirrorless lenses is to be saddled with the baggage of the past. There really is a lot that can be done in terms of size, weight reduction, AF performance (good for video as well), and making lenses fast, with good corner-to-corner sharpness.

However, the use of adapters will be there as a transition to EF-M. That is a given. Canon, even with its deep pockets can't simply build to replace all existing lenses it has. It will take them 10 years or so to get maybe 12-18 lenses out. Meanwhile, they will have to do with existing lenses. Canon will experience the same criticisms of the lack of lenses their fans hurled at Sony, the MFT and Fuji when they were revamping their lens lineup.

As a new owner of an M6 kit + 22mm f2.0, I see this lack of EF-M lenses and this is not new to me, being an owner of other brand MILCs. But having an adapter helps in the transition. So, I can live with the size and weight of a 50mm f1.8 STM mounted on my M6, while a native sony 50 f1.8 OSS beats it in size, weight and it has IS as well. It also comes with a lens hood and I don't have to worry scouting for a cheaper 3rd party lens hood to complete it.