IB/E Optics BavEyes boosters for fullframe and medium format lenses
IB/E Optics was responsible for the optic and mechanic design of the the IB(E speedbooster "BavEyes" . IB(E designed several different systems to fit nearly all known brands in the market to speed up 24x36mm lenses as well as medium format lenses as Hasselblad. So the L/R - Nex title means Leica lenses in use with Sony NEX . A Leica R 4,0 / 35 - 70 will become a 2,8 / 24,5 - 49 mm and delivers the same field of view on the SONY NEX camera as the original lens on a Leica Body.