Commlite electronic lens mount adapter AEF-MFT Booster can change the EF Mount lens over the M4/3 Mount cameras, and meanwhile can achieve functions as: USB Firmware Upgrading; 0.71x Focal Reducer Booster; EXIF Info. Transmitting; Support Auto Focus Function; Electronic Aperture Control; Built-in IS Stabilization Function; Gold-plated Contact Pins, which satisfy all the photography or video users who need this super combination. Before usage of the adapter, please ensure the adapter is compatible with your camera and lens.Features:0.71X focal reducer booster, can increase one gear of aperture and the light through the lens, as well as reduce focal length.Support auto focus function, electronic aperture control, EXIF info.transmitting, and built-in IS stabilization function.With USB port for adapter firmware upgrading.Gold-plated contact pins for great conductivity.Aluminum alloy made, CNC processing; with 1/4 screw hole at the bottom.  Notice:1.Increase the ApertureIncreasing one gear of aperture to blur the background and better highlight the theme. CM-AEF-MFT Booster will be a good choose for shutterbug.2.Reduce Focal LengthThis adapter built-in with optical correction group, when using the adapter, the focus of the lens should be multiplied by 0.71, then multiplied by 1.5 (the focus multiplier), is the lens’ actually equivalent focus .For example, the 50mm focal length is mounted on APS-C camera:50mm ( EF lens Focal Length) x0.71( EF-E Mount Adapter )x 1.5 (APC-C Conversion Rate )=53.25mmSpecifications:Compatible Lens: EF series lens (please find the specific compatible lens models from picture)Compatible Camera: M4/3 mount camera (please find the specific compatible camera models from picture)Camera-mount Outer Diameter: 40mmLens-mount Outer Diameter: 65mmItem Weight: 126g / 4.4oz(without caps)Package Size: 11 * 9.5 * 6cm / 4.3 * 3.7 * 2.4inPackage Weight: 215g / 7.6ozNote:This adapter supports the EF series lens and does not support EF-S series lens for the flange distance feature, and currently does not support the BMPCC camcorder.Package List:1 * Lens Mount Adapter1 * Front Cap1 * Rear Cap1 * Users' Manual(English & Chinese)