The TTArtisan 21mm f1.5 Lens is one of the smallest and lightest full frame wide-angle lenses. Its all-metal body with 13 elements in 11 groups and 10 diaphragm blades, weighing 422-458g. Included a tulip flower lens hood and a round filter holder(filter size:72mm) that help to block stray light from causing lens flare and also offer some physical protection to the front of the lens. The broad field of view is complemented by the bright f/1.5 maximum aperture, which excels in low-light conditions as well as for isolating subjects using selective focus techniques. The ultra-wide field of view renders space suits interior, street, architecture, and landscape shooting.