YONGNUO YN50MM F1.4C F1.4 Lens Large Aperture Auto Focus Lens for Canon(Black) 1. F1.4 bright & large aperture: Real bokeh background blur helps to highlight the subject easily. Even in low light environment, you can take photo with low sensitivity and relatively high shutter speed. 2. Electromagnetic aperture: Support MAvTvPB shooting modes. 3. 7pcs diaphragm blades: Help to take picture of circular defocused spots or 14-star effect. 4. Live view focusing(LV): When LV is ON, it can focus from special angles, or focus precisely from the broadened view on the display screen. 5. Auto & manual focus: This can meet different shooting needs. And there is built-in focus distance indicator to help you judge the focusing distance in manual focus mode. 6. Glass optical lens, multi-layer coating: Effectively increase light transmittance and control backlight ghost image and glare. 7. Gold-plated contact, high-accuracy chrome-plated metal mount: It's wearable, corrosion-resistant, and highly consistent with the camera. 8. USB firmware upgrade: You can download the latest firmware and upgrade this lens through the USB port to keep the best performance and compatibility of this lens.