When driving at night, I'm using an old smartphone as a heads-up display on the windshield. It works great, except the HUD is out of focus with the road. I believe an infinity focus lens would fix this (correct me if I'm wrong, I know very little about lenses).

It's tough to search for infinity focus lenses on the internet, as infinity focus camera lenses are a popular topic. Anyone know where I can get one, or know how to make one?