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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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.
DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.