The Mayima 645 Autofocus lens 28mm comes with  AF D Asph, or Af D LS Asph features; they both have the same aperture range, equivalent focal length,  and minimum focusing but the LS Asph has a leaf shutter.
28mm AF D Asph f/4.5 0.35 m No 28mm AF D LS Asph f/4.5 0.35 m Yes 
