I need to collimate a small beam of light from an LED. Getting the light from the LED focused is the easy part. Where I am having difficulty is in the collimation. I have a varied assortment of lenses. From large, heavy, glass ones from old projectors... To cheap, little, plastic ones from toy binoculars and cameras and such... I have been trying various things. Using the converging lens from an old slide projector, I can collimate the light emitted by an LED. However, if I try to focus that light first, I cannot seem to. I am not seeking perfectly parallel rays. If my little beam would remain just a small spot for a few centimeters, that would be enough. Any help, suggestions, ideas... I would highly appreciate it. I am starting to run out of ideas. In my head, it does not seem like it should be this hard.