Some of the features of the Sony 12-24mm f2.8 lens are:

    E-Mount Lens/Full-Frame Format
    Aperture Range: f/2.8 to f/22
    Three XA Elements, Two Super ED Elements
    Nano AR II and Fluorine Coatings
    XD Linear Motor AF, Internal Focus
    Floating Focus System
    Dust and Moisture-Resistant Construction
    Rounded 9-Blade Diaphragm