A free program for Windows, by Gopher and MyGoodEye.

DYNAVISION is a powerful tool for creating cinematic depth of field effects. It provides you with the ability to blur the background of your photo while keeping the focus on your subject.

DYNAVISION is designed to be used in combination with SkyUI, and you can adjust the settings to suit your needs. You may adjust DYNAVISION as you like, in-game using the MCM system that comes with SkyUI 3 or later.

DYNAVISION provides a dynamic depth-of-field effect similar to a camera.

In other words, when you’re close to something and looking right at it, the subject stays in focus while the background blurs.