Build quality is impressive, and optical performance is outstanding stopped down a bit, so long as field curvature is understood and acceptable for the task (40/4 in particular). These are working pro lenses that should serve for many years of use.
When I started reviewing the Hartblei 40/80/120, I focused on the tilt/shift aspect of performance. With time, I realized that the most appealing aspect (for me) was the outstanding bokeh and color rendition, with the tilt/shift options a very nice option, but a secondary one. In some ways I wish the same optics were available in a standard barrel (non tilt/shift), if that would shrink the size/weight significantly.
Studio photographers will adore these lenses; their technical capabilities along with color rendition and bokeh make them winners for that “medium format look” using a Nikon D3x or similar camera. The way they render sharp/unsharp is truly remarkable, and makes competing designs look flat by comparison.
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