LensBaby (original)

Lensbaby captures images with glowing highlights, subtle prismatic color shifts and the trademark Lensbaby graduated blur. The Original Lensbaby, with its raw and imperfect or soft and ethereal images, shines for portrait, black and white, and artistic photography.

The Original Lensbaby features a single, uncoated optical glass element which is quite sharp at f/5.6 and f/8 but becomes softer and slightly diffused at f/4 and more diffused and impressionistic at f/2.8.

More info at http://www.lensbabies.com/