Rectilinear lens

1. What does a rectilinear lens do?
2. What is the difference between rectilinear and fisheye perspective?
3. What is rectilinear perspective?

What does a rectilinear lens do?

In photography, a rectilinear lens is a photographic lens that yields images where straight features, such as the edges of walls of buildings, appear with straight lines, as opposed to being curved. In other words, it is a lens with little or no barrel or pincushion distortion.

What is the difference between rectilinear and fisheye perspective?

A fisheye lens is one that translates a portion of a sphere onto a flat surface, which is what gives them their distinctive lens, whereas a rectilinear lens is one that tries to preserve straight lines. Because of this, you can't really directly compare focal lengths between fisheye and rectilinear lenses directly.

What is rectilinear perspective?

Rectilinear Perspective

This is to say that lines that are straight in the subject are reproduced straight in the picture. Most pictures are made with rectilinear lenses. Fisheye lenses and the lenses used on panoramic cameras produce a false perspective. A panoramic lens produces panoramic or cylindrical perspective.