j_sum1 - 5-6-2016 at 02:40
http://www.bbc.com/news/science-environment-36438686
Really cool concept. It looks really practical too -- potential for large cheap high-quality lenses with no chromatic aberration and better focussing
ability combined with the ability to design for niche applications.
I am not fully sure I understand how it works: seems like an extension of a diffraction grating concept. But if it works (as it seems to) then this
could revolutionise a lot of things.
unionised - 5-6-2016 at 04:30
If the way it works is anything like a diffraction grating (and it looks like it might be) then the chromatic aberration will be much worse than a
conventional lens.
That may not matter much in some applications.
PHILOU Zrealone - 5-6-2016 at 10:26
Seems to play with various effects:
-diffraction grating
-refractive index through 2 or 3 different materials
-Young's slit diffraction experiment
joeweller - 5-6-2016 at 10:38
yes a really cool concept, this will be so helpful if it hit the markets soon
macckone - 5-6-2016 at 11:48
Looks like classic fresnel with a layer of a second material to adjust for chromatic dispersion.
[Edited on 5-6-2016 by macckone]
Sulaiman - 5-6-2016 at 11:52
I suppose that one lens / sensor pair per wavelength would be practical and cost-effective,
maybe we can have VERY wide spectrum cameras ?
j_sum1 - 5-6-2016 at 12:04
Well the article (admittedly journalism rather than a scientific report) mentions that there is less aberration. Chromatic aberration is the most
likely thing being referred to. They also suggest the first use may be in cellphone cameras -- an application where you would not want chromatic
aberration. So, while I agree with you, unionised, it appears that they may have found a solution to that issue. Which is what makes me wonder if I
understand the mechanism at all.
No time to research right now, but if anyone has come across a more detailed explanation that would be good.
unionised - 5-6-2016 at 12:23
There are lots of lens aberrations so you could still have one of them but claim to have removed some.
You can get by with chromatic aberrations if you can refocus the camera and take three pictures- G, G and B.