Recent content by spiffly

the thin lens equation will allow me to solve for f, or distance to object or image, and for the magnification equation, I can solve for magnification, and object or image height. In my case I have the light source closer to the lens than the focal point, so these equations just give me...

Hi Andy, Thanks for your response. I do understand that because the LED isn't a point light, even if I place the light source at the focal point, it will slowly diverge; is this what you're talking about by saying it's finite? So it sounds like I can use the thin lens equation (1/f = 1/o...

Hi, Can anyone help me on this? Stated very simply, if I have an aspheric lens for which I know the focal length, and I place a point light source at a given distance from the lens, how can I calculate the resulting beam angle coming out of the lens? Perhaps the formula would be the same for...

Hi, I'm using an aspheric lens with a LED light source for a DIY projector. As I understand it, if I place the led light source at the focal length of the aspheric lens, the light should be collimated(parallel) coming out the other side. As I decrease the distance between the led and the...