1. 
   Diffraction Limited
   Electromagnetic waves diffract around the edges of opaque objects or on passing through or reflecting off a finite aperture, like a dish, lens or mirror. Even if such a wave is perfectly collimated, so that the beam emitted is parallel, it will eventually spread out. The larger the aperture in rel...
   Found op http://www.coseti.org/glossary.htm
   
   
2. 
   Diffraction Limited
   Describes an optical system in which the quality of the image is determined only by the effects of diffraction and not by lens aberrations.
   Found op http://www.diracdelta.co.uk/science/source/d/i/diffraction%20limited/source
   
   
3. 
   diffraction-limited
   Said of an optical system that meets the Rayleigh criterion, or, put another way, that can bring light to a focus at the theoretical minimum of the Airy disk. To be diffraction-limited there must be no more than ¼ wavelength of light between wavefronts at the focal point. Modern optical systems can...
   Found op http://www.daviddarling.info/encyclopedia/D/diffraction-limited.html
   
   

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