Specifications:Brand: YONGNUOModel: YN50mm F1.4Focal Length: 50mmAngle of View: 46 (Diagonal), 27(Vertical), 40(Horizontal)Lens Construction: 7 Groups 9 ElementsAperture Blades: 7pcsMin. Aperture: f/22Min. Focusing Distance: Approx. 0.45mMax. Magnification: Approx. 0.15 timesDriving System: Direct Current MotorFilter Diameter: 58mmMax. Diameter & Length: Approx. 81 * 93mmItem Weight: 595g / 1.31LbsPackage Size: 13 * 10.5 * 10.5cm / 5.1 * 4.1 * 4.1inchPackage Weight: 714g / 1.57Lbs YONGNUO YN50mm F1.4 standard prime lens features F1.4 large & electromagnetic aperture, 7pcs diaphragm blades, live view focusing, auto & manual focus. It is a nice choice for bokeh background blur and 14-star effect.Features: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.Electromagnetic Aperture - Support M/Av/Tv/P/B shooting modes.7pcs Diaphragm Blades - Help to take picture of circular defocused spots or 14-star effect.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.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. Glass Optical Lens, Multi-layer Coating - Effectively increase light transmittance and control backlight ghost image and glare.Gold-plated Contact, High-Accuracy Chrome-Plated Metal Mount - Its wearable, corrosion-resistant, and highly consistent with the camera.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.