I don't agree at all. Neither a lens or a sensor will care about if you photograph a Dollar bill, or details on a redfern or twigs on a dead tree 200 m away.
But I want to have my test reproducible.
Macro vs. Infinity lens performance are not the same. A lens may well be much sharper at infinity than it's closest focus distance (or vice versa). The sharper the lens the less diffraction can be tolerated if the goal is to get the sharpest image the system can produce.
Also in macro photography the effective aperture regarding diffraction are not the same as the marked aperture of the lens.
e.g. here is an extreme macro example where diffraction kicks in at a lens marking of f/2.8 and is severe by f/5.6.http://www.captureintegration.com/2009/08/25/extreme-macro/
Yet another vote for real-world testing in situations as close to your actual intended use as possible.
Doug Peterson (e-mail Me)
Head of Technical Services, Capture Integration
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