Today a brand new Sony patent application has been published. And it shows Sony found a solution to improve the E-mount “usability”. I guess that with “usability” they mean they want to reinforce the E-mount for the use with the upcoming big FE lenses like the 400mm f/2.8 FE and the rumored 500mm and 600mm f/4.0 lenses. I guess the future Sony A9II is a hot candidate to use this “updated” mount system.
It’s clear from the drawings how this works. Sony writes:
The purpose of the present invention is to improve usability. The present invention comprises the following: a ring-shaped mounting unit to which accessories can be attached; an imaging element that receives light from an object being imaged, the light entering through an aperture; a barrier that moves between a shut position at which the aperture is shut and an open position at which the aperture is open; an operated unit for causing the barrier to move according to an accessory-attachment operation performed on the mounting unit; and an operation unit that moves the barrier regardless of the accessory-attachment operation performed on the mounting unit. The operation unit is positioned on the inner side or the front surface side of the mounting unit.