Af 56mm F1.7 is an autofocus lens suitable for X-mount, with 11 elements in 9 groups. The focus distance is about 0.55m-Infinite, and noiseless Stm focus motor can accurately control the moving position and bring accurate and smooth focusing.Auto Focus Large Aperture Portrait LensNew Generation Lightweight SeriesGolden Portrait Perspective56mm F1.7 is a full-frame equivalent focal length of about 85mm, with a golden portrait perspective, bringing just the right three-dimensional sense of characters and background perspective.New Generation Lightweight Series56mm F1.7 Xf is Viltrox's new generation of lightweight series autofocus large aperture mid-telephoto prime lens with higher cost performance.Golden Focal Length56mm F1.7 is a full-frame equivalent focal length of about 85mm, with a golden portrait perspective, bringing just the right three-dimensional sense of characters and background perspective.