B4 LENS TO SONY E MOUNT (NEX) CAMERA ADAPTER with Heavy Duty Tripod Mount Use professional Canon, Fujinon & Nikon 2/3" B4 lenses on: Sony A3500, A6000, A5000, A5100, A6500 Sony A7 / A7s / A7r / A7 II / A7sii / A7rii / A7riii / A9 (Enable Clear Image Zoom mode to avoid vignetting) Deluxe adapter with tripod mount allows use of B4 lenses without a complicated rail system. The tripod bracket has 1/4" and 3/8" screw mounts. Adapter is made of Duraluminum ( alloy of aluminum and titanium ) anodized black. The adapter was manufactured with pinpoint precision and high strength to support heavy video lenses. 2/3" lenses do not cover the whole sensor of APS-C and Full Frame formats without vignetting >> But now you can use 2/3" lenses in 2x without vignetting on Sony A7 / A7r A7s / A7ii when you enable 2x Clear Image Zoom mode. >> On Sony a6000, α3500 α5000, α5100 enable 1.4x or higher Clear Image Zoom. The adapter is adjustable for back focus however it should not require any adjustment. Set the back focus on your lens.