Comment Re:Not that new (Score 1) 59
Now if they would only take those four lenses, put them in a tube and 'cloak' an absorber around the focal point to remove stray light, they would have a marvelous invention. I suggest calling it a telescope.
It really only requires 2 lenses, but in both a 4-lens (do such refractors exist? seems overly complicated) or 2 lens telescope the "cloaking" is only one direction and relies on the fact that the thing being "cloaked" is out of focus.
Anyone with a big aperture telescope can see this effect quick clearly without any fancy staging/setup at all. Simply look through the telescope at a distant object and then put your finger in front of the objective aperture. The only thing you will see is a very slight dimming as your finger passes in front of the aperture, and this includes the finger being right in the middle.