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06/05/2006 01:19:35 PM · #1 |
New f/0.0 50mm lens, okay, so it's still a way off. But this is pretty interesting in it's future potential.
A new material structure that has 100% light pass-through. They just created the prototype but expressed future potential for telescopes and photography.
Click Here... |
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06/05/2006 01:34:57 PM · #2 |
If the refractive index is so low, wouldn't that make it difficult to make an effective lens from? Wouldn't f/0.0 be impossible, as the aperture would be infinitely large? Are we there yet? Can I have an ice cream?
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06/05/2006 01:39:50 PM · #3 |
| Quote "Unlike normal glass, which reflects some of the incoming light, the new so-called metamaterial --composed of a grid of gold or silver nanocoils embedded in a prism-shaped, glass-like material -- uses its unique structural properties to achieve a negative refractive index..." |
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06/05/2006 01:53:20 PM · #4 |
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06/05/2006 01:53:57 PM · #5 |
Originally posted by theSaj:
Quote "Unlike normal glass, which reflects some of the incoming light, the new so-called metamaterial --composed of a grid of gold or silver nanocoils embedded in a prism-shaped, glass-like material -- uses its unique structural properties to achieve a negative refractive index..." |
Yes, I read that bit, but doesn't the refractive index identify by how much the light is bent at the surfaces of the material? I thought that the higher the refractive index, the more the light gets bent when entering and leaving the material. I could well be wrong, as this is stuff I'm dimly remembering from school twenty-five years ago.
edit: forgot to quote. D'oh!!
Message edited by author 2006-06-05 13:55:00.
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06/05/2006 01:55:58 PM · #6 |
hmmmmm, couldn't yeild very sharp image, could it?
Canon had a f0.95 for the old range finder camera line. Focus on the nose and the eyes were soft.
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06/05/2006 01:57:52 PM · #7 |
| I think this might make for better anti-reflection coatings one day, but as indicated above - I don't think it would make a good lens. The main thing stopping light getting into the camera is the size of the apeture, not the transparency of the glass. |
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06/05/2006 01:59:30 PM · #8 |
Actually, now that I think of it, what does "f/0.0" have to do with this? 100% transmission of light doesn't have anything to do with f/stop, which is just a ratio of the diameter of the aperture against the focal length of the lens...
R.
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06/05/2006 02:19:38 PM · #9 |
Righto, the aperture size is something separate entirely. What they are doing here is designing a material that reflects *nothing* and transmits everything. That would do the following:
- Eliminate the need for anti-reflective coatings
- completely eliminate flare and ghosting
- increase contrast
- completely eliminate color casts imparted by glass
It would not really make the lens much faster, though on lenses where there are more than a dozen elements, it might make a 1/3 stop difference, max.
Now a negative refractive index, that's another interesting thing! Normally, rays entering a lens off-vertical to the surface are bent toward being vertical. In a negative-index material, they would be bent *awaty* from vertical. That means a convex lens would be divergent, and a concave lens convergent. Would have some potentially major implications for lens design.
FWIW, the material works on the quantum level, and depends on the feature size being smaller than the wavelenth of the light being processed. |
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06/05/2006 02:24:24 PM · #10 |
| From what I've read it also must be tuned to a particular wavelength. I'd think this would be okay for B&W or infrared, but limits the usefulness for color. |
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06/05/2006 02:27:18 PM · #11 |
The Press Release:
Discovery Research Institute
Nanophotonics Laboratory
Chief Scientist: Dr. Satoshi Kawata
Senior Research Scientist: Dr. Takuo Tanaka
Development of a Noble Optical Devise Stopping Light Reflection from Material Border Surface, Controlling Light Reflection by Metallo-Nanostructural Material, Opposing to Common Sense of Optics
Eternal glory of diamond attracts human mind. The glorious reflection light from diamond is scientifically explained by the large difference in the refraction indices between the air and diamond; all the incoming light is perfectly coming out by reflection. Light reflection at the border between materials due to the difference in their refraction indices, however, is problematic loss in the application to optical communication through glass fiber because part of the initial light does not enter the fiber by reflection.
In order to solve the problem, Nanophotonics Laboratory in Discovery Research Institute attempted to provide a noble optical devise based on "Brewster phenomenon." New prisms, called "meta-material prisms," are composed of transparent solid material like glass in which nano-meter sized coil of rare metals such as gold, silver, etc. are processed and integrated. Using this new devise, the group established new technology to pass all the light without reflection light from material border surface, while overcoming the problem due to the difference in refractive indices.
Meta-material prisms are expected to open new age to develop new lineups of optical appliance.
The research details are reported in the reference; Physical Review B, 73 (12), (2006).
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06/05/2006 02:30:10 PM · #12 |
Originally posted by _eug:
From what I've read it also must be tuned to a particular wavelength. I'd think this would be okay for B&W or infrared, but limits the usefulness for color. |
Yes, dispersion is a big issue according to some of the earlier work with microwaves. Here is an article on that. |
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06/05/2006 02:38:32 PM · #13 |
| Can't you use three primary colors to mix all others? RGB |
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06/06/2006 10:12:16 AM · #14 |
Maybe so the saj, but if each lens is only tuned to a particular wavelength, you would need 3 separate lenses to tune all of them to RGB specific wavelengths. That would be effectively the same as moving the microlenses which are currently in front of each photosite on the sensor to a filter on the front of the lens. Unfortunately, this would also mean that you would be unable to have a single image because you can't use more than one lens for a sensor without getting some really bad dual image type effects.
If you have ever seen those old 3D comics that you wear the red/blue glasses for, that's what your pictures would look like.
Which is why eug said that it might have uses for IR or B/W. |
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06/06/2006 11:12:54 AM · #15 |
Thinking about it...
...beyond a camera lens, the embedded gold and silver material could in theory be connected to an electron, which in turn could be connected to a computer, enabling camoflauge transformations, or...whats the proper word...(brain fart)....it's on the tip of my tounge....
Like the bad guy in Terminator 3 who was able to change into whatever...
...ahhhgggg....whats that term???
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06/06/2006 05:27:56 PM · #16 |
Originally posted by scarbrd:
hmmmmm, couldn't yeild very sharp image, could it?
Canon had a f0.95 for the old range finder camera line. Focus on the nose and the eyes were soft. |
Stanley Kubric shoot Barrie Lindon with some Zeis Lens that where f0.7 and he had it in focus when he used it you just have to be smart and use the right part if the barrel on the lens. He had a 50mm and a 35mm both f0.7. These lens where used on the interieor Night shoots that where light by candel light. |
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