超写实3D渲染，中世纪钢制骑士头盔，做旧哑光银灰色钢材，表面带有使用划痕、凹痕与轻微锈迹，顶部设小巧锥形尖顶，盔体分布多组圆形透气孔，额头处带有三角金属加固片，面甲开狭长横向观察缝，下方阵列三排圆形呼吸孔，盔身侧面有铆钉固定的活动铰接结构，头盔下缘垫红色织物衬边，外围衔接银灰色金属锁子甲护颈，深灰色渐变纯色背景，侧顶光照明，中近景特写，3:4竖幅构图，金属质感真实细腻。

Ultra-realistic 3D rendering of a medieval steel knight's helmet, made of distressed matte silver-gray steel with usage scratches, dents and slight rust on the surface. A small conical spike sits on the top of the helmet shell, multiple sets of circular ventilation holes are distributed on the shell, a triangular metal reinforcing plate is located on the forehead, a narrow horizontal observation slit is opened on the face guard, and three rows of circular breathing holes are arrayed below the slit. A movable hinge structure fixed by rivets is on the side of the helmet, a red fabric lining is padded under the lower edge of the helmet, and silver-gray metal chainmail neck guard is connected to the outside. Dark gray gradient solid background, side top lighting, medium close-up shot, 3:4 vertical composition, delicate and realistic metal texture.