This is a lightweight and compact manual wide-angle lens with a mass of 262g. The lens barrel is made of high-quality metal, giving it a premium feel. With a wide open aperture of F1.8, it's very bright and can produce beautiful bokeh. The focal length is 21mm, and the aperture can be adjusted steplessly. Because there is no clicking sound, you can adjust it without the sound interfering during video recording. [Specifications] Focal Length: 21mm Maximum Aperture: F1.8 Minimum Aperture: F16 Angle of View: 68 degrees (APS-C format) Lens Construction: 10 elements in 8 groups Minimum Focusing Distance: 12cm Focus: Manual Focus (MF) Dimensions: 58 x 57mm Weight: Approximately 262g Thank you.