Again, though, what do you want to do with lasers? What do you want a lens for a laser to do? Holography makes a great hobby project, by the way, and you can

Again, though, what do you want to do with lasers? What do you want a lens for a laser to do? Holography makes a great hobby project, by the way, and you can get started with a laser pointer (or equivalent) as your laser.