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Thread: Beating the diffraction limit

  1. #1
    David J. Heinrich
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    Oct 2008
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    Beating the diffraction limit

    Negative index metamaterials allows for the diffraction limit to be beaten, although a perfect image of the object still can't be reconstructed. I hope that in the years to come when this technology is introduced, large format will also receive the benefit of negative index metamaterials lenses.

    Beating the diffraction limit

    (a lot of this stuff went well over my head)

  2. #2

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    Nov 2007
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    Re: Beating the diffraction limit

    Quote Originally Posted by dh003i View Post
    Negative index metamaterials allows for the diffraction limit to be beaten, although a perfect image of the object still can't be reconstructed. I hope that in the years to come when this technology is introduced, large format will also receive the benefit of negative index metamaterials lenses.
    Don't believe a physicist, if one uses negative-refractive-index material as a taking lens the light will be accelerated above the speed of light and so one can get a black hole in the camera.

    BTW every thin metal layer like used as dicroic-filter-layer has a negative refractive index too.
    Last edited by Peter K; 1-Sep-2010 at 00:14. Reason: speed of light

  3. #3

    Join Date
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    Lund, Sweden
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    2,214

    Re: Beating the diffraction limit

    Perfect lenses like this have been realised. But they work at 1:1 with a working distance of the order of the wavelength being focussed.

    You might as well contact print. :-)

  4. #4

    Join Date
    Aug 2010
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    36

    Re: Beating the diffraction limit

    There is a much simpler way to beat the "normal" diffraction limits when doing b/w: shooting with ortho- or unsensitized film or using colour filters in the direction of the blue part of the visible spectrum.

    How can this work? With normal film you have for instance at f22 a diffraction limit of about 70 lines per millimeter (for shooting infinity) for panchromatic-film whose spectral-sensitivity-curve is centered at about 500 nm. When shooting ortho- or even unsensitized material, the center of the spectral-sensitivity-curve is shifted more and more in the blue direction of the spectrum. At corresponding wavelengths for instance at 486 nm you have already an increased diffraction limited resolution of 75 lpm (f22, infinity) and at 436 nm a (17 % higher than at 500 nm) value of 82 lpm (f22, infinity). I think you see where I want to go....

  5. #5

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    Mar 2006
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    Austin, TX
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    435

    Re: Beating the diffraction limit

    I getting out of here, your guys are getting too weird for me.

    Lynn

  6. #6

    Talking Re: Beating the diffraction limit

    Don't get mad Lynn, I know you and your CV too well and you have way too much lens know how to participate here
    Klaus

    http://www.macrolenses.de for macro and special lens info
    http://www.pbase.com/kds315/ for UV Images and lens/filter info
    http://photographyoftheinvisibleworld.blogspot.com/ my UV diary

  7. #7

    Join Date
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    Austin TX
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    Re: Beating the diffraction limit

    Quote Originally Posted by A49 View Post
    There is a much simpler way to beat the "normal" diffraction limits when doing b/w: shooting with ortho- or unsensitized film or using colour filters in the direction of the blue part of the visible spectrum.

    How can this work? With normal film you have for instance at f22 a diffraction limit of about 70 lines per millimeter (for shooting infinity) for panchromatic-film whose spectral-sensitivity-curve is centered at about 500 nm. When shooting ortho- or even unsensitized material, the center of the spectral-sensitivity-curve is shifted more and more in the blue direction of the spectrum. At corresponding wavelengths for instance at 486 nm you have already an increased diffraction limited resolution of 75 lpm (f22, infinity) and at 436 nm a (17 % higher than at 500 nm) value of 82 lpm (f22, infinity). I think you see where I want to go....
    Sounds like you might want to go to eximer laser illumination at say 190 nm if you could find the glass to handle it along with a suitable emulsion.

    Nate Potter, Austin TX.

  8. #8

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    Sep 2009
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    Portland, OR USA
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    747

    Re: Beating the diffraction limit

    Electron beam in a vacuum. Tough on portrait subjects, though.

    Peter Gomena

  9. #9

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    Re: Beating the diffraction limit

    Quote Originally Posted by Peter Gomena View Post
    Electron beam in a vacuum.
    Miles resp. nanometers away from the diffraction limit!

    With electron lenses, only positive lenses are aviable, so one can only use very small (numerical) apertures.

  10. #10

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    May 2004
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    Re: Beating the diffraction limit

    Quote Originally Posted by Peter Gomena View Post
    Electron beam in a vacuum. Tough on portrait subjects, though.

    Peter Gomena
    Great art is worth suffering for.

    --Darin

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