I'm looking to make a light with a collimated beam, I know its not possible to get perfect collimation without a true point source, but trying to do the best I can with a LED. Also, I'm going for collimation here more then throw.
My thought was a convex lens pair of different focal length to provide a reduction in the projected die image at the focal point of the 2nd lens. Place a ground glass diffuser at this focal point and this would become a virtual "die" for the rest of the system. Then simply put a lens in front of the diffuser, with the diffuser surface at its focal point, to better emulate a point source. Obviously 3 lenses and a diffuser will cause a decent amount of lumen loss, but I think brute force and just shoving more down the pipe to begin with will be the solution for that.
On something like this, how big would the output beam be? Would it just be as big as the active optical area of the final lens?
Thanks for any input!
My thought was a convex lens pair of different focal length to provide a reduction in the projected die image at the focal point of the 2nd lens. Place a ground glass diffuser at this focal point and this would become a virtual "die" for the rest of the system. Then simply put a lens in front of the diffuser, with the diffuser surface at its focal point, to better emulate a point source. Obviously 3 lenses and a diffuser will cause a decent amount of lumen loss, but I think brute force and just shoving more down the pipe to begin with will be the solution for that.
On something like this, how big would the output beam be? Would it just be as big as the active optical area of the final lens?
Thanks for any input!