This is a Prototype of an Electronically-Controlled ND Filter Lens Adapter
At the IBC 2015 trade show in Amsterdam, which just wrapped up a couple of days ago, the camera gear company Genus was showing off a prototype of a groundbreaking new product: an electronically controlled neutral density (ND) filter adapter. It was a Canon EF to Sony E lens adapter that had a dial that lets you adjust the level of ND filtration electronically.