Yongnuo YN 50mm f/1.4 Lens for Canon EF Highlights 

• Normal prime is designed for full-frame Canon EF-mount DSLRs, however can also be used with APS-C models where it provides an 80mm equivalent focal length.
• Fast f/1.4 maximum aperture affords a great deal of control over depth of field for isolating subjects and using selective focus, and also benefits working in low-light conditions.
• Four ultra-high refractive index elements help to minimize distortion and spherical aberrations for greater sharpness and accurate subject rendering.
• Individual glass elements feature a multi-layer coating to resist flare and ghosting for improved contrast and color fidelity.
• A DC motor is used for quick and accurate autofocus performance, and a dedicated switch lets you quickly change from AF to MF control. A focus distance scale is also featured to aid with pre-focusing techniques.
• Chrome-plated metal lens mount is durable and accurate for a secure fit with the camera body, and gold-plated contacts help to ensure consistent communication between the lens and camera.
• Seven-blade diaphragm contributes to a smooth bokeh quality.
• A micro-USB port is incorporated for updating the lens's firmware.