YONGNUO YN50mm F1.8 Lens Large Aperture Auto Focus Lens For Canon EF Mount EOS Camera 1.Gold plating technology on metal contacts, effectively improve conductivity and corrosion resistance 2.Lens multilayer coating, effectively improve the light transmittance 3.Support auto-focus (AF) and manual focus (MF) model 4.Adopt high quality plastic as an external structure, and the overall weight is only 120 g, convenient location 5.Support the full format and APS - C format cameras