This SIGMA-made lens has a magnification ratio of 0.14. The aperture of the lens is maximum ƒ/1.4 and minimum ƒ/16.
From Amazon
Sigma 24mm f/1.4 DG DN Art Lens for Leica L
The product is available from £659.39 at international stores.
Clifton Cameras
Sigma AF 24mm F1.4 DG DN Art Lens - L-Mount