A filter in the adapter can be used with multiple lenses of varying front diameter. One could have one CPL that works on 72, 77, and 82mm etc front elements without having to own multiple sizes of CPLs or mess with step up/down rings that interfere with lens hoods. Same for NDs. As a video shooter this would really streamline switching lenses in the field. Basically for the same reason the cinema bodies have internal NDs.
What would be really cool would be if the ND in the adapter is a variable ND.
exactly.
Upvote
0