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Message: <blockquote data-quote="tjsimonsen" data-source="post: 1279596" data-attributes="member: 38764">There are a couple of theoretical upper limits (determined by shear physics) for the resolving power of the sensor. The one you mention is determined by the actual lens. Whereas the 50D and the 1Ds mark III probably exceed the resolving power of medium quality lenses, I doubt that they have yet reached the limits of real top class glass such as 300/2.8L or 100/2.8 macro. There is off course also the limit of the sensor itself. At one point we will reach the lower limit for how small the actual pixel can be an still yield a signal to noise ratio that is good enough to increase the real resolution of the sensor. I think we are still someway from that "final wall". At the moment technology is still the limit, physics are not.Thomas</blockquote>