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Richard over at Canon News has written an opinion piece about the new Canon RF mount and what it means for the Canon ecosystem. He feels, as others do, that the EOS M system and EF-M mount are surrounded with some uncertainty.
From Canon News:
Canon this September 5th is releasing the RF mount for full frame mirrorless. This mount by all reports is 54mm in diameter for the inner throat diameter and 20mm in depth. While this mount by itself sounds good, it has long term negative ramifications on the EOS system over time, that has us surprised they are doing this unless there are tectonic shifts in direction throughout Canon’s lineup.
The problem with this new mount, is not what you can do with it, but what you can’t do with it. Canon in 2012 created a new mount for APS-C mirrorless called the EF-M mount. It has a 46mm throat diameter and a 18mm registration distance. Because of the difference in between the two mount registration distances (the distance between the sensor and the mount flange) of only 2mm, there will never be an EF-M camera to RF lens adapter, nor will there ever be a RF APS-C camera that can use EF-M lenses with an adapter. Read the full article
As excited as we are about the Canon EOS R and RF lenses, we do wonder what’s in store for the EOS M system going forward. We are getting that fast prime in the EF-M lineup with the EF-M 32mm f/1.4 STM, but we can’t help but hope there is more coming down the pipeline for the Canon EOS M system.