This page shows the sharpness and contrast possible with outstanding optics.
Since this is a camera evaluation, the focus here is on sharpness across the aperture range, and how soon diffraction comes into play in light of the 5.7-micron photosites. The entire frame was examined, and found to crispy-sharp even wide open at f/2, even in the far corners. This is expected with the Zeiss 100/2 Makro-Planar.
Modulation transfer function (MTF) and 1D Mark IV resolution
The optical resolution required for the 1D Mark IV slightly exceeds that of the 24MP Nikon D3x. Thus, it is very demanding of optical performance. In particular, a lens must deliver not just resolution, but high micro contrast in order to produce results that look sharp.
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