In article ,
Gregory W Blank wrote:

I doubt that is correct 38mm does not seem that wide, I have a 40mm lens for 6x6
and its not even close to fisheye. Are not 16mm lenses on 35mm considered fisheye?

The term "fisheye" refers to the projection type, not the field of view.

A 16mm lens could be either fisheye (preserving relative area in the
projected image) or rectilinear (preserving angles in the projected image).
I own a 15mm fisheye lens for a 35mm system, but I am also aware of 14mm and
12mm rectiliear lenses for these systems.

Fisheye lenses are tyipcally wide angle, simply because a) you can get a
wider field of view with a fisheye lens (it is not physically possible to
project a 180 degrees field of view onto a flat surface in a rectilinear
manner), and b) a telephoto fisheye lens would just look like a rectilinear
lens with a bad case of barrel-distortion.