Features: EF-M adapter allows EF/EF-S lenses to be used with Canon EOS M mirrorless cameras. Supports autofocus (AF) functionality. Provides precise aperture alignment through the mount adapter. Durable zinc alloy core. Gold-plated electrical contacts. 1/4-inch female thread for tripod mounting. Note: Autofocus speed may vary when using prime lenses. Specifications: Compatible lenses: Canon EF and EF-S series lenses Compatible cameras: Canon EOS M mirrorless cameras Front mount: Canon EF mount Rear mount: Canon EOS M mount Tripod screw: 1/4-inch thread Maximum diameter and length: 7.2 x 8.4 cm / 2.8 x 3.3 in Package dimensions: 12 x 10 x 6.5 cm / 4.7 x 3.9 x 2.6 in Package weight: 300 g / 10.6 oz Package List: 1 x Lens Mount Adapter 1 x User Manual (English)