For those worried about diffraction.......

Started Nov 17, 2009 | Discussions thread
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For those worried about diffraction.......
Nov 17, 2009

With the release of each new Canon sensor, Canon increases the MP with corresponding smaller pixels.......resulting in a sensor more sensitive to diffraction (see below), and I can only assume Canon's going to keep adding MP.

If the problem of diffraction is a real concern to you.....(I am not as of yet worried).........Is the only real alternative a move to Nikon and their fewer MP sensors?

If your answer is YES say so in the subject line of your response, if NO what other alternative will you go to or method will you use to reduce diffraction?

Taken from

The Canon 7D sensor appears to effected by diffraction sooner than all other Canon DSLR's starting at f/6.3.

  • DLA (Diffraction Limited Aperture) is the result of a mathematical formula that approximates the aperture where diffraction begins to visibly affect image sharpness at the pixel level. Diffraction at the DLA is only barely visible when viewed at full-size (100%, 1 pixel = 1 pixel) on a display or output to a very large print. As sensor pixel density increases, the narrowest aperture we can use to get perfectly pixel sharp images gets wider.

DLA does not mean that narrower apertures cannot be used. And in fact, higher resolution sensors generally continue to deliver more detail well beyond the DLA - until the "Diffraction Cutoff Frequency" is reached (a much narrower aperture). The progression from sharp the soft is not an abrupt one - and the change from immediately prior models is usually not dramatic.


Photography is full of IF's, every general rule has exceptions, even the exceptions have exceptions.

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