Re:Engineers produce a fisheye lens that’s completely flat
by ben_w on Saturday September 19, 2020 @05:16AM
(#24526204)
That sounds like it would make it ridiculously easy to make VR headsets that are as thin as the prop glasses used in Westworld.
What are the downsides?
Re:Engineers produce a fisheye lens that’s completely flat
by dTal on Saturday September 19, 2020 @07:41AM
(#24526750)
Wavelength specificity. You only get the original focal depth at the wavelength you used to make the hologram, and it changes proportional to the wavelength. When you consider that blue light is 2/3 the wavelength of red light, you can see that this is chromatic aberrations big brother.
Re:Engineers produce a fisheye lens that’s completely flat
by cycomanic on Saturday September 19, 2020 @12:39PM
(#24528644)
Diffractive elements are very wavelength dependent so while something like this would only work for monochromatic light (like a laser), but not for multiwavelength light. For that you would need to do some colordiversity.
Except I don't think it is. It's probably more like a diffraction grating or a hologram. You can actually make a flat lens by creating a hologram of a real lens and it will be flat.