Nikon remains one of the pioneering manufacturers with respect to perspective control lenses of which this 28mm f3.5 PC Nikkor AI-S lens is a fine example. This lens retains a manual lens diaphragm, which means that lens apertures must be opened and closed via stop-down metering. In plain English, it's not nearly as automatic as most other Nikkor lenses - both manual focusing and autofocusing - when it comes to setting the desired aperture and taking the photograph. But those who are interested in both architecture and landscape photography will appreciate the fact that this lens will adjust apparent distortions by manually shifting the lens angle via its tilt and shift feature (For example if you came up close to a forest and photographed with a regular 28mm lens, the resulting image would look as though the forest was "falling down"; instead with this perspective control lens, any photograph of the forest will show that it is still standing erect.).
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