Probably, anyone who deals with visualization, especially of architecture, have faced the need of creating an image without perspective distortion. In particular, it is the rendering of the orthogonal projection of the facade of a building or a straight interior elevations.
In most cases, the most common question on this theme is: "How to render a facade without the perspective using VRayPhysicalCamera?" The answer is quite simple - in no way with completely no perspective with VRayPhysicalCamera :)
It is easy to guess that to get rid of perspective, you simply need to increase the focal length, simulating the telephoto lens and reducing the perspective distortions to a minimum.
In any case, it will be only the relative visual similarity with the orthogonal projection, while in fact not being it.