Colourful Window -- NEX-5N & Bell & Howell 76mm f1.6 Projection Lens. Click for larger.
This lens only works with helicoids 32mm or shorter. With a 17-32mm helicoid, it will focus to infinity as well as being able to focus pretty close. If you are thinking of trying projection lenses, but still sitting on the fence, I would suggest that you give it a try. Right now projection lenses are still very cheap. It's a ton of fun shooting with one, not to mention the confusion you see from some people's face when they see what you are shooting with!
Afternoon Reading -- NEX-5N & Bell & Howell 76mm f1.6 Projection Lens.