Very shallow DOF with a long lens

While testing out different DOF settings in DAZ 3D I wanted to see how much I could push having a shallow DOF. The type where the eyes are sharp in focus and the tip of the nose is starting to go out of focus.

I used an HDRI for the background and lighting and one added keylight (spotlight) on camera right.

The lens was set at 312mm, focal distance of 215, and the F/Stop at 22.

Shallow DOF test in DAZ 3D

This is the side view showing how narrow the DOF is in DAZ 3D.

Here's a top view showing the camera, key light, and character's position. If you look very closely you can see the very thin DOF.