The adapter can combine EF series lens with Sony E S35 cinema camera or APS-C camera A5000 A5100 A6000 A6100 A6300 A6400 A6500 A6600 A6700. EF-S APS-C lenses couldn't be used with this dapter. 0.71x focal reduction lens mount adapter can reduce the focal length of 0.71 times, improve the luminous flux, and increase the aperture by one gear. Supports automatic focusing, automatic aperture, anti-shake and other lens function. The aperture can be adjusted through the manual aperture thumbwheel. Built in 4 groups of 5 elements optical glasses. The design of gold plated PIN brings excellent signal transmission. MK-EFTE-071X