question about bmc mft

hi,
i preorderd bmc ef model but have question for the mft. why it is not possible to use adaptor and use manual mft lenses where u can adjust the iris manually? hope u can answer it to me because iam still thinkin about it.
edit: adaptor to use mft lenses on ef mount
i preorderd bmc ef model but have question for the mft. why it is not possible to use adaptor and use manual mft lenses where u can adjust the iris manually? hope u can answer it to me because iam still thinkin about it.

edit: adaptor to use mft lenses on ef mount