The new compact, lighter,
Series E lenses were also the first batch of Nikkor lenses that came with a revised specification of AI-S (Standardized aperture stop down action). The Series-E lenses is also the only batch of lenses produced by Nikon that is not stamped with a “Nikkor” trade name. These new updates resolved the complexity involved with enabling an SLR to provide Shutter Priority and full Programmed Auto exposure modes, since the aperture could now be controlled via the aperture stop down action.