One of the big frustrations with high resolution digital is alignment:
- Plane parallelism of the lens mount to the sensor.
- Alignment of the lens optics to the lens flange.
- Symmetry through focusing rotation of of the optics themselves—almost never perfect no matter what the brand— a slight focusing change and the symmetry across the field shifts.
High-res digital is very sensitive to flange-to-sensor alignment, especially at infinity focus. Below is documented a image in which the combination of the Nikon D800E + 135mm f/2 APO-Sonnar shows a right-side blur problem.
The camera is the primary suspect, because not long before, two 35mm lenses (Zeiss 35/1.4 and Sigma 35/1.4) also showed a forward skew of focus on the right side.
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Since 2007, Diglloyd Guide to Zeiss is the authoritative reference and review for all of the Zeiss ZF.2 (for Nikon) and Zeiss ZE (for Canon) DSLR lenses, including the Otus line.
It includes hundreds of pages of exclusive coverage and high resolution Retina-grade examples, in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, and recommendations and practical usage tips.