Lens specifications refer to the detailed characteristics of a camera lens that determine its performance and suitability for different photography styles. Key specifications include focal length, which affects the lens's field of view, and aperture size, which influences the amount of light entering the lens and depth of field. Other important specifications include the lens type, such as prime or zoom, and the image stabilization feature, which helps reduce blurriness from camera shake. Additionally, the lens mount compatibility with specific camera bodies, like those from Canon or Nikon, is crucial for ensuring proper functionality.