The Samyang 85mm f/1.4 Aspherical IF Lens for Sony E-Mount Cameras is a compact telephoto prime lens that is compatible with both full frame and APS-C formats and provides a focal length equivalence of 127.5mm when used on Sony E-mount APS-C mirrorless digital cameras. The fast, bright f/1.4 maximum aperture is effective in low light situations and provides shallow depth of field control.