Nikon says, "An electromagnetic diaphragm mechanism is incorporated inside the body of lenses and controlled via electronic signals from the camera body. This permits incredibly accurate aperture control even during high-speed continuous shooting."Oh, does Nikon now use F-mount lenses with an "E" designation?
The first E lenses Nikon introduced were three tilt/shift perspective-control PC-E lenses in 2008: 24mm/f3.5, 45mm/f2.8, and 85mm/f2.8. Due to their tilt-shift nature, a mechanical aperture control was impossible.
Modern E lenses started in 2012 when Nikon introduced the 800mm/5.6 E AF-S VR, which is quickly followed by:
- 400mm/f2.8, 500mm/f4, and 600mm/f4 E AF-S VR super teles
- 300mm/f4 E PF AF-S VR PF.
- 200-500mm/f5.6 E AF-S VR
- 24-70mm/f2.8 E AF-S VR
- 16-80mm/f2.8-4 E DX AF-S VR for Nikon’s APS-C format DSLRs.
Based on Nikon's printed lens catalogue It appears the entire S-Line are also E lenses, even tough they may not have the "E" designation.
So, yes, Nikon has been innovative for quite a while.