Ricardo88 wrote:What are the cons of using an adapter like this?
Suppose that all my lenses are EF, but I have no problem controlling the aperture manually, should I choose the BMCC MFT mount option?
Unless you are deliberately limiting yourself with the offerings from Canon EF lens using the BMC sensor size you should always consider the flexibility of the MFT mount.
You should ask yourself would you rather have an S35 sensor size version of the BMC? The MFT fast wide lenses is the only option that get you close to S35 style filmmaking because none of the EF lens could.