Ultra-realistic extreme close-up of a blue human iris, photographed with a 100mm macro lens at 1:1 magnification. The iris is perfectly sharp, showing intricate fiber patterns, natural reflections, and high detail. The pupil is centered, the lighting is soft and directional to enhance depth and texture. Background is pure black with smooth gradient shadows. Photographic style, 4K resolution, shallow depth of field, high contrast. See more