I wish I could find the schematic photo on whatever forum I saw it posted, but it looked like the current mechanical nd shutter design that Canon has been using sticks out farther than the 24mm flange distance of the RF mount. My guess is that Canon will add an RF mount and the variable ND from their EF to RF mount adapter to whatever replaces the C100 and go from there.I wonder what the hang-up is? There are real cameras with built-in ND with shallower mounts than RF, like the F55/5(FZ) and Fs7/II & Venice(E).
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