aeAnamorphic is a simple way to give a realistic anamorphic look to your compositions with real distortion charts and automatic breathing.
Here you can see a video explaining how to use it, you may find a more updated version on nukepedia or github.
Anamorphic lenses capture an extremely wide view without distorting faces, even with extreme closeups. The lenses can help create ultra-wide rectangular aspect rations, oval broken (out of focus area of the images), and long horizontal lens flares. There are two types of lens that films use: spherical and anamorphic. A spherical lens is more common and projects unaltered circular images to the sensor. An anamorphic lens projects oval-shaped images to the sensor by using optical elements to fit more horizontal data to the scene. The captured image is then stretched horizontally in post-production or when projects to appear as intended.