Feature: Multi-layer coating filter, clear picture quality Large wide-angle ,fixed focal length ，excellent blur effect，for natural scenery, landscape, portrait, food, humanities, still life blur Made of space aluminum alloy material, durable, compact and light Manual focus , manual apterture Specification: Aperture:f/1.8-16 Number of Diaphragm Blades: 8 Blades Focus: focus to infinity Minimum Focus Distance:15cm Lens filter thread : 37mm Field Angle for APS-C Lens Type: Manual Weight:0.19kg .