Diffraction at the DLA is only barely visible when an image is viewed at full-size (100%, 1 pixel = 1 pixel) on a monitor or when output to a very large print. As sensor pixel density increases (on any brand camera), the narrowest aperture we can use to get perfectly pixel-sharp images gets wider.

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Simply speaking, when this disc size exceeds the size of a pixel in your cameras sensor then you will have diffraction or your camera is then regarded as being ...

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And, higher resolution sensors generally continue to deliver more detail than lower resolution sensors at apertures narrower than the DLA – until the "Diffraction Cutoff Frequency" is reached. The progression from sharp the soft as the aperture narrows beyond DLA is not an abrupt one – and the change from immediately prior camera models to new models is usually not dramatic.

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Check out this specific diffraction comparison example using the ISO 12233 chart comparison tool. The mouseover feature will show you the image quality degradation at f/11 by comparing to f/5.6.

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Many cameras have been tested using the lens shown in that example. Learn how diffraction affects your image quality from your specific camera (or select a camera that has similar pixel density to your camera). When faced with a narrow aperture situation, you will have the knowledge to make the right decision.

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DLA does not mean that narrower apertures should not be used – it is simply the point where image sharpness begins to be compromised for increased DOF and longer exposures.

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You will find "DLA" referenced in many of the DSLR camera reviews on the site. DLA is an acronym for Diffraction Limited Aperture. This aperture value is the result of a mathematical formula that approximates the aperture where diffraction begins to visibly negatively affect image sharpness at the pixel level.