This is an in-depth review of the Nikon 45mm f/2.8D PC-E, also known as PC-E Micro Nikkor 45mm f/2.8D ED, a special purpose normal-angle lens designed for architecture, commercial, macro, and nature photography. “PC” stands for “Perspective Control”, but I will refer to this type of lens as “tilt-shift” in this article.

Architecture and cityscape photographers often work with straight lines, and tilt-shift lenses enable the photographer to avoid the convergence of vertical lines by shifting the lens upwards or downwards.
…
Read full post here:
https://photographylife.com/reviews/nikon-45mm-f2-8d-pc-e