And there is more! This is the same shot with the focus ring untouched, I turned the T stop ring from wide open to T6.7 (camera showing f6.3 on the EXIF). The STF function does NOT make the background more blurry but it brings the out of focus (OOF) objects back to their shape. This is true to the laws of optical physics. The lens is being stopped down and the DOF is extending.

The Apodisation element, which took the hard edges out, along with a circular aperture, creates OOF objects into interesting shapes that are smooth and yet defining. This makes the bokeh more lively, and contrasty.

**Note: apparently the camera cannot display "f6.7", it says f6.3 on the EXIF. When you look at the shutter speed on later images you can tell the exp value is different from the real f6.3 used with the regular aperture ring.