Feature:1. Equipped with a round filter holder to support the installation of 72mm/2.8in diameter filters.2. The front of the lens is equipped with removable metal hood, one corner is hollowed out to prevent obstructing the eyepiece viewing angle.3. Metal lens barrel, aviation‑grade aluminum anodizing process, fine sandblasted surface, focus is equipped with metal focus handle.4. F1.5 large aperture with 21mm wide‑angle length, enables the background to show information in humanistic subjects, and obtain a three‑dimensional sense of space.5. 13 elements in 11 groups optical structure design, including 5 high‑folding lenses and 1 APSH lens structure, compressed in 70mm in length.How to Use:1. Set the camera to the lensless release mode, otherwise the camera will not be able to take pictures.2. Align the lens mount identification point with the fuselage mount identification point, and rotate clockwise when you hear a "click" sound, it means the lens has been installed in place.3. If you need to remove the lens from the camera, press the body lens removal button, and then rotate the lens counterclockwise to take it out.Specification:Item Type: 21mm F1.5 LensMaterial: Aluminum + Optical GlassColor: As Picture ShownWeight: Approx. 676.0g/23.8ozFocal Length: 21mm/0.8inOptical Structure: 13 Elem