The tilt function can be used to provide sharp rendition of architectural features that would otherwise be impossible to capture, even with stopping down to f/32.
There is a flip side however: by favoring one area, other areas are blurred.
The Schneider 90/4.5 used swing (e.g., tilt left/right) to bring the row of columns into sharp focus even wide open at f/4.5.
The wedge of sharpness resulting from swing as used here leaves the areas away from the columns blurred, as can be seen at left and right, and especially at right. This effect is less noticeable with distance, and with stopping down.
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